TASK 70-33-02-300-503 The Procedure To Apply Chromium Plate on Stainless Steel, Nickel And Cobalt Base Alloys

DMC:V2500-00-70-33-02-01A-647A-D|Issue No:003.00|Issue Date:2018-02-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 70-33-02-300-503 The Procedure To Apply Chromium Plate on Stainless Steel, Nickel And Cobalt Base Alloys

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
OvenLOCALOven

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION. THESE CONTAIN INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

    1. SUBTASK 70-33-02-300-001 Remove the Chromium Plate

    1. Always use the procedures that follow, unless specified differently in the Engine Manual repair instructions. Some steps refer to parts with hardness values of Rockwell C40 or higher. Temperatures of more than 325 deg F (162 deg C) can cause damage to such parts. All carburized parts and all gears and gearshafts are included in this group and must not become too hot. Always find the hardness values of low alloy or high strength low alloy steel parts before you continue with the steps that refer to hardness values of Rockwell C40 or higher.

      2. Remove all remaining plate, by one of these procedures:

      1. NOTE

        If necessary, some of the plate can be removed with a machine to decrease the removal time.

        Remove the plate with chemicals, as specified in steps C. thru K.

      2. Grind the parts to the dimensions used before the plate was applied, and the limits specified in the Repair instruction. Do not do steps C. thru K.

    3. If necessary, remove the grease. Refer to SPM TASK 70-11-03-300-503.

    4. CAUTION

      IF YOU USE WAX FOR A MASK, MAKE A SELECTION OF A WAX THAT WILL NOT MELT OR GET SOFT DURING THE PROCEDURE.

      Apply a mask to the areas where the plate is not to be removed. Refer to SPM TASK 70-38-24-300-503.

      5. WARNING

        ALWAYS TURN OFF THE CURRENT BEFORE YOU PUT THE PARTS INTO THE SOLUTION, OR REMOVE THE PARTS FROM THE SOLUTION.

        Remove the chromium plate, by one of these procedures:

        1. Put the parts fully into one of the subsequent solutions. The solution temperature must be 110 to 130 deg F (43 to 54 deg C). Use anodic, at 5 to 7 volts.

        1. Heavy duty alkali cleaner solution - Solution Code 39 (refer to SUBTASK 70-33-02-100-001).

        2. Chromium strip solution - Solution Code 41 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-002).

        3. Chromium strip solution -Solution Code 135 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-018).

        4. Electrolytic cleaner solution (noncyanide) Solution Code 169 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-022).

        2. Alternatively:

          1. Put the parts fully into one of the subsequent solutions with no current, for 1 to 3 minutes. The solution temperature must be 110 to 130 deg F (43 to 54 deg C).

          1. Heavy duty alkali cleaner solution - Solution Code 39 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-001).

          2. Alkali cleaner solution (medium duty) - Solution Code 47 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-003).

          3. Alkali cleaner solution (heavy duty, phosphate-free) - Solution Code 58 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A02).

          4. Electrolytic cleaner solution (noncyanide) - Solution Code 165 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-023).

          5. Electrolytic cleaner (heavy duty), phosphate-free and cyanide-free solution - Solution Code 137 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-020).

          6. Electrolytic cleaner solution (noncyanide) - Solution Code 169 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02 -100-022).

        2. Flush the parts in cold water, at room temperature, for 30 seconds.

          3. CAUTION

            EXAMINE THE PART FREQUENTLY. REMOVE THE PARTS IMMEDIATELY WHEN THE CHROMIUM PLATE IS FULLY REMOVED. REMOVE THE PARTS IMMEDIATELY IF CHEMICAL DAMAGE TO THE BASE METAL OCCURS.

            NOTE

            For stainless steel or nickel base alloys, it is permitted to increase the solution temperature to 150 deg F (66 deg C) to increase the plate removal rate.

            To remove the chromium plate from the parts, put the parts fully into one of the subsequent solutions at room temperature for the necessary time:

            NOTE

            Solution Code 70 will remove the plate at a rate of approximately 0.001 inch (0.025 mm)/hour.

          1. Inhibited hydrochloric acid solution - Solution Code 70 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-005).

          2. Hydrochloric acid pickling solution (refer to SPM TASK 70-33-17-100-501, SUBTASK 70-33-17-100-001).

        4. Flush the parts in cold water, at room temperature, for 30 seconds.

          5. To make the part neutral, put the part fully into one of the subsequent solutions for 30 to 60 seconds. The solution to be at room temperature.

          1. Heavy duty alkali cleaner solution - Solution Code 39 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-001).

          2. Chromium strip solution - Solution Code 41 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-002).

          3. Alkali cleaner solution (medium duty) - Solution Code 47 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-003).

          4. Alkali cleaner solution (heavy duty, phosphate-free) - Solution Code 58 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A02).

          5. Electrolytic cleaner solution (noncyanide) - Solution Code 165 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-023).

          6. Electrolytic cleaner (heavy duty) phosphate-free and cyanide-free solution - Solution Code 137 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-020).

          7. Electrolytic cleaner solution (cyanide-type, phosphate-free) - Solution Code 154 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-024).

          8. Electrolytic cleaner solution (noncyanide - Solution Code 169 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-022).

    6. Flush the parts in cold water, at room temperature, for 30 seconds.

      NOTE

      This step is optional.

    7. If necessary, the parts can be cleaned more fully. Refer to SPM TASK 70-12-08-300-503 or SPM TASK 70-12-11-300-503.

    8. Remove the mask from the parts.

    9. Flush the parts in hot water, at 140 deg F (60 deg C), for 60 to 90 seconds.

    10. Dry the part with compressed air.

    11. Examine the parts to make sure that all the chromium plate is fully removed.

    12. All parts with a hardness of Rockwell C40 or higher must be heat-treated in an oven, with a temperature of 275 to 325 deg F (135 to 163 deg C), for two hours. Do this operation within four hours after the chemical strip process to remove the chromium plate.

    13. If necessary, apply oil preservation to the part with at room temperature for 30 to 60 seconds. Refer to SPM TASK 70-38-05-380-501.

    14. If necessary, remove the grease. Refer to SPM TASK 70-11-03-300-503.

    2. SUBTASK 70-33-02-240-001 Fluorescent Magnetic Particle Inspection

    1. Do a fluorescent magnetic particle inspection of all ferrous parts to find all cracks caused during the chemical and/or mechanical removal of the chromium plate (as specified in the Inspection section of the applicable Engine Manuals).

    3. SUBTASK 70-33-02-230-001 Fluorescent Penetrant Inspection

    1. Do a fluorescent penetrant inspection of all non-ferrous parts to find all cracks caused during the chemical and/or mechanical removal of the chromium plate (as specified in the Inspection section of the applicable Engine Manuals).

    4. SUBTASK 70-33-02-300-002 Prepare the Parts for the Chromium Plate

      1. Shotpeen the surface to be chromium plated to an intensity of 6A for material thickness 0.060 to 0.120 in. (1.52 to 3.05 mm) and to an intensity of 12A for material thickness greater than 0.120 in. (3.05 mm), unless specified differently in the Engine Manual repair instructions. The shotpeened areas must be larger than the areas to be chromium plated.

      1. Shotpeen all carburized parts and parts with hardness values of Rockwell C40 or higher before they are chromium plated. They must not be heat-treated after they are plated.

        NOTE

        The shotpeen procedure is optional on parts which are to be heat-treated after they are chromium plated (refer to SUBTASK 70-33-02-300-003, Paragraph 7.P.).
        The procedure to be used is also optional, unless specified differently in the Engine Manual repair instructions.

      2. Shotpeen all parts with hardness values of less than Rockwell C40 before they are chromium plated if no heat treatment is to be done after they are plated.

    2. Parts which are not critical will not be shotpeened or heat-treated after they are plated. This will be specified in the Engine Manual repair instructions.

    5. SUBTASK 70-33-02-300-003 Apply the Chromium Plate

    1. NOTE

      Chromium plate can be applied in two applications, with machining between applications, if necessary, as long as the chrome is re-activated. Proof of adhesion will be demonstrated by final machining. This two-step procedure is applicable for both rotating and non-rotating parts but is limited to new chrome on top of new chromium. It is not for application over chromium which has been in service nor to be used to exceed Engine Manual limits for plating thickness.

      Always use the procedures that follow, unless specified differently in the Engine Manual repair instructions. Some steps refer to parts with hardness values of Rockwell C40 or higher. Such parts can be damaged by temperature of more than 325 deg F (162 deg C). All carburized parts and all gears and gearshafts, are included in this group and must not become too hot. Always find the hardness value of low alloy or high strength low alloy steel parts; before you continue with the steps that refer to hardness values of more than Rockwell C40 or higher.

    2. CAUTION

      IF YOU USE WAX FOR A MASK, MAKE A SELECTION OF A WAX THAT WILL NOT MELT OR GET SOFT DURING THE PROCEDURE.

      Apply a mask to the areas where the plate is not be applied. Refer to SPM TASK 70-38-24-380-501.

      3. WARNING

        ALWAYS TURN OFF THE CURRENT BEFORE YOU PUT THE PARTS INTO THE SOLUTION, OR REMOVE THE PARTS FROM THE SOLUTION.

        Alkali clean the parts, by one of the procedures that follow:

        1. Put the parts fully into one of the subsequent solutions for 1 to 3 minutes, at 25 to 35 Amps/square foot (ASF). The solution temperature must be 110 to 130 deg F (43 to 54 deg C). Use a periodic reverse cycle of 10 seconds on anodic and 10 seconds on cathodic; stop cycle on anodic.

        1. Alkali smut removal solution - Solution Code 48 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A01).

        2. Alkali cleaner solution (heavy duty, phosphate-free) - Solution Code 58 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A02).

        3. Electrolytic cleaner (heavy duty), phosphate-free and cyanide-free solution - Solution Code 137 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-020).

        4. Electrolytic cleaner solution (cyanide-type, phosphate-free) - Solution Code 154 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-024).

        5. Alkali smut removal solution - Solution Code 156 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-025).

        2. Alternatively:

          1. Put the parts fully into one of the subsequent solutions with anodic only, at 10 to 15 ASF. The solution temperature must be 110 to 130 deg F (43 to 54 deg C).

          1. Heavy duty alkali cleaner solution - Solution Code 39 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-001).

          2. Alkali cleaner solution (medium duty) - Solution Code 47 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-003).

          3. Electrolytic cleaner solution (noncyanide) - Solution Code 165 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-023).

          4. Electrolytic cleaner solution (noncyanide ) - Solution Code 169 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-022).

      3. Alternatively, put the parts fully into an electrolytic caustic cleaner (refer to SPM TASK 70-33-16-300-503, SUBTASK 70-33-16-300-007).

    4. Flush the parts in clean water, at room temperature, for 30 seconds.

      5. Etch and flush the stainless steel parts and the nickel or cobalt base alloy parts. Put the parts fully into one of the subsequent solutions only. Make the parts anodic, at 60 ASF, for 1 minute. The solution must be at room temperature.

      1. 65 percent hydrochloric acid solution - Solution Code 36 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-008).

      2. 40 percent sulfuric acid solution - Solution Code 31 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-009).

      3. Sulfuric-hydrofluoric acid solution - Solution Code 37 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-010).

      4. Acid salt solution - Solution Code 46 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-011).

      5. Flush the parts in clean water, at room temperature, for 30 seconds.

      6. Compressed air/water spray rinse the parts at room temperature.

      6. Remove the smut from the parts:

        1. Put the part fully into one of the subsequent solutions at a solution temperature must be 110 to 130 deg F (43 to 54 deg C). Use a periodic reverse cycle for approximately 30 seconds; 10 seconds on anodic and 10 seconds on cathodic, to stop on anodic. If the smut is not fully removed, continue the procedure for approximately 1 minute at 25 to 35 ASF.

        1. Alkali smut removal solution - Solution Code 48 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A01).

        2. Alkali cleaner solution (heavy duty, phosphate-free) - Solution Code 58 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A02).

        3. Electrolytic cleaner (heavy duty) phosphate-free and cyanide -free solution - Solution Code 137 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-020).

        4. Electrolytic cleaner solution - Solution Code 154 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-024).

        5. Alkali smut removal solution - Solution Code 156 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-025).

      2. Alternatively, put the part fully into an electrolytic caustic cleaner (refer to SPM TASK 70-33-16-300-503, SUBTASK 70-33-16-300-007).

      3. Flush the parts in clean water, at room temperature, for 30 seconds.

        4. Put parts fully into one of the subsequent solutions with no current, for 30 to 60 seconds. The solution must be at room temperature.

        1. 65 percent hydrochloric acid solution - Solution Code 36 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-008).

        2. 40 percent sulfuric acid solution - Solution Code 31 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-009).

        3. Sulfuric-hydrofluoric acid solution - Solution Code 37 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-010).

        4. Acid salt solution - Solution Code 46 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-011).

      5. Alternatively use sulfuric acid solution parameter (refer to SPM TASK 70-33-16-300-503, SUBTASK 70-33-16-300-007).

        NOTE

        This step is only necessary when smut has not been fully removed.

        6. Put the stainless steel and nickel or cobalt base alloy parts fully into one of the subsequent solutions for 6 to 12 seconds. The solution must be at room temperature.

        1. Nitric-hydrofluoric acid solution - Solution Code 33 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-012-A01).

        2. Titanium etching solution - Solution Code 32 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-012-A02) or SPM TASK 70-33-08-100-501, SUBTASK 70-33-08-100-003).

          3. Descaling solution - Solution Code 50 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-013).

          1. Flush the parts in clean water, at room temperature, for 30 seconds.

      7. Chromium plate the stainless steel parts and the nickel or cobalt base alloy parts as follows:

        1. Put the parts fully into one of the subsequent solutions until the parts and the solutions are at 115 to 135 deg F (46 to 57 deg C).

        1. Chromium plating solution - Solution Code 40 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A01).

        2. Chromium plating solution - Solution Code 42 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A02).

        3. Self-regulating chromium plating solution - Solution Code 43 (refer to SPMTASK 70-33-02-100-501, SUBTASK 70-33-02-100-015).

        4. Chromium plating solution - Solution Code 138 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-021).

          NOTE

          When plating with Solution Code 89, IAE recommends that you use another solution as an etch before plating. This etching solution can be:
          Chromium plating solution - Solution Code 40 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A01).
          Chromic acid solution - Solution Code 88 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A03).
          Chromium plating solution - Solution Code 42 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A02).

      2. Alternatively, put the parts fully into the high speed chromium plating solution - Solution Code 89 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-016) until the parts and the solution are at 130 to 140 deg F (54 to 60 deg C).

      8. Chromium plate the parts which are not stainless steel as follows:

        1. Put the parts fully into one of the subsequent solutions until the parts and the solutions are at 115 to 135 deg F (46 to 57 deg C).

        1. Chromium plating solution - Solution Code 40 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A01).

        2. Chromium plating solution - Solution Code 42 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A02).

        3. Chromic acid solution - Solution Code 88 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A03).

        4. Self-regulating chromium plating solution - Solution Code 43 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-015).

        5. Chromium plating solution - Solution Code 138 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-021).

          NOTE

          When plating with Solution Code 89, IAE recommends that you use another solution as an etch before plating. This etching solution can be:
          Chromium plating solution - Solution Code 40 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A01).
          Chromic acid solution - Solution Code 88 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A03).
          Chromium plating solution - Solution Code 42 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A02).

      2. Alternatively, put the parts fully into the high speed chromium plating solution - Solution Code 89 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-016) until the parts and the solution are at 130 to 140 deg F (54 to 60 deg C).

      3. Make the part anodic, at 0.4 amp/square inch (0.062 amp/sq cm), for 2 minutes.

      4. Remove the parts from the solution.

      5. Do a check for anode alignment, etching, and cleanness.

      6. Do step H. again if the etch is not satisfactory.

      9. Chromium plate the parts.

        1. Use one of these solutions at a temperature of 115 to 135 deg F (46 to 57 deg C).

        1. Chromium plating solution - Solution Code 40 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A01).

        2. Chromium plating solution - Solution Code 42 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-014-A02).

        3. Self-regulating chromium plating solution - Solution Code 43 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-015).

      2. Alternatively use the high speed chromium plating solution - Solution Code 89 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-016) which must be at a temperature of 130 to 140 deg F (54 to 60 deg C).

      3. Make the parts cathodic for 2 minutes at 0.4 amp/square inch. (0.062 amp/sq cm), then slowly increase the current to 1.5 to 5.0 amp/square inch (0.232 or 0.775 amp/sq cm) to apply the chromium plate to the necessary thickness.

    10. Flush the parts in clean water, at room temperature, for 30 to 60 seconds.

      11. CAUTION

        IF YOU USE WAX FOR A MASK, MAKE A SELECTION OF A WAX THAT WILL NOT MELT OR GET SOFT DURING THE PROCEDURE.

        To make the parts neutral, put the parts fully into one of the subsequent solutions for 12 to 18 seconds. The solution temperature must be 120 to 210 deg F (49 to 99 deg C).

        1. Use one of the solutions in the subsequent list at 120 to 210 deg F (49 to 99 deg C):

        1. Heavy duty alkali cleaner solution - Solution Code 39 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-001).

        2. Chromium strip solution - Solution Code 41 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-002).

        3. Alkali cleaner solution (medium duty) - Solution Code 47 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-003).

        4. Alkali cleaner solution (heavy duty, phosphate-free) - Solution Code 58 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-007-A02).

        5. Heavy duty electrolytic cleaner without phosphate or cyanide - Solution Code 137 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-020).

        6. Electrolytic cleaner solution (cyanide-type, phosphate-free) - Solution Code 154 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-024).

        7. Electrolytic cleaner solution (noncyanide) - Solution Code 165 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-023).

        8. Electrolytic cleaner solution (noncyanide) - Solution Code 169 (refer to SPM TASK 70-33-02-100-501, SUBTASK 70-33-02-100-022).

        2. Use the subsequent solution at room temperature (typically 60 to 80 deg F (15 to 25 deg C):

        1. Chromium strip solution -Solution Code 135 (refer to SPM TASK 70-33-02-100-501 SUBTASK 70-33-02-100-018.

    12. Flush the parts in cold water, at room temperature, for 30 seconds.

    13. Remove the mask from the parts.

    14. Flush the parts in hot water, at a minimum temperature of 140 deg F (60 deg C), for 30 seconds.

    15. Dry the parts with compressed air for 60 to 90 seconds.

    16. As necessary, heat treat the parts in an oven, with a temperature of 725 to 775 deg F (385 to 413 deg C), for two hours (refer to SPM 'TASK 70-33-02-300-503Step.

    17. Examine chromium plate by SPM TASK 70-33-02-220-502.

    18. If necessary, apply oil preservation to the parts. Refer to SPM TASK 70-38-05-380-501.

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised procedure to add Solution Code 135 as an alternative neutralization solution (REA17VC357)

Change Type:

Revised procedure to remove the word "the" (REA17VC357)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Oven
Tool Name:Oven