Preliminary Requirements

Safety Requirements

WARNING

YOU MUST USE THE NECESSARY CLOTHING TO GIVE YOU PROTECTION. THIS MUST INCLUDE RUBBER GLOVES AND GOGGLES.

WARNING

IF YOU GET AN AGENT OR A SOLUTION IN YOUR EYES, YOU MUST IMMEDIATELY CLEAN IT AWAY WITH A SUFFICIENT QUANTITY OF WATER FOR A LONG TIME. YOU MUST GET IMMEDIATE MEDICAL AID.

WARNING

IF YOU GET AN AGENT OR A SOLUTION ON YOUR SKIN, YOU MUST CLEAN IT AWAY WITH A LARGE FLOW OF CLEAN WATER.

WARNING

YOU MUST GET MEDICAL AID FOR ALL BURNS (THIS INCLUDES SMALL BURNS) AT THE NEAREST SURGERY OR FIRST-AID POST.

WARNING

THE SURGERY OR FIRST-AID POST MUST BE TOLD WHICH AGENT OR SOLUTION HAS CAUSED THE BURN.

WARNING

DO NOT ADD LARGE QUANTITIES OF SODIUM HYDROXIDE OR CAUSTIC SODA TO ONE PART OF THE TANK. APPLY THE CHEMICALS EQUALLY ACROSS THE SURFACE OF THE SOLUTION.

WARNING

THE BLACK OXIDE SOLUTION HEATER MUST ALWAYS BE INSTALLED ON THE SIDE OF THE TANK, ABOVE THE SLUDGE LEVEL.

WARNING

WHEN WATER IS ADDED TO THE SOLUTION IT MUST BE FULLY MIXED, TO PREVENT A WATER GAS EXPLOSION WHEN THE SOLUTION BOILS.

WARNING

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

Procedure

1. SUBTASK 70-33-17-300-001 Remove the Used Black Oxide Layer

   1. 

      CAUTION

      STEEL PARTS THAT HAVE A TENSILE STRENGTH OF MORE THAN 65 TON F/IN2 (1000 MN/M2) OR A HARDNESS OF 302 HB OR 310 HV MUST BE STRESS RELIEVED (BEFORE THE PICKLING PROCEDURE). THIS STRESS RELIEF HEAT TREATMENT IS DONE AT A TEMPERATURE OF 374 TO 410 DEG F (190 TO 210 DEG C) FOR ONE HOUR. AFTER THE PROCESS, PARTS WHICH NEEDED STRESS RELIEF MUST HAVE A DE-EMBRITTLEMENT HEAT TREATMENT AT A TEMPERATURE OF 374 TO 410 DEG F (190 TO 210 DEG C) FOR TWO HOURS. THIS PREVENTS CRACKS CAUSED BECAUSE OF HYDROGEN EMBRITTLEMENT. IF DIFFERENT TIMES AND TEMPERATURES ARE NECESSARY THEY WILL BE SPECIFIED IN THE APPLICABLE ENGINE MANUAL. THE ENGINE MANUAL RECOMMENDS THE HEAT TREATMENT FOR PARTS THAT HAVE A TENSILE STRENGTH OF MORE THAN 90 TON F/IN2 (1384 MN/M2). BE CAREFUL WITH PARTS UNTIL DE-EMBRITTLEMENT IS COMPLETE. DE-EMBRITTLEMENT MUST BE DONE AS QUICKLY AS POSSIBLE AFTER THE PROCEDURE IS COMPLETED.

      Clean the part to remove the grease, refer to the SPM TASK 70-11-01-300-503.

   2. If necessary stress relieve the steel parts. Heat treat them for one hour at 374 to 410 deg F (190 to 210 deg C) unless the applicable Engine Manual gives different instructions.

   3. Put the part fully into the hydrochloric acid pickling solution (refer to the SPM TASK 70-33-17-100-501 SUBTASK 70-33-17-100-001 and SPM TASK 70-33-17-200-502 SUBTASK 70-33-17-200-001) at temperature of 59 to 77 deg F (15 to 25 deg C) for ten minutes, or the inhibited hydrochloric acid solutions refer to the SPM TASK 70-33-02-100-501 SUBTASK 70-33-02-300-001, para E(2)(c)). Do this unless the applicable Engine Manual gives different instructions.

   4. Clean the part fully in a clean flow of cold water.

   5. Clean the part with CoMat 02-008 PUMICE POWDER to remove the possible inert layer.

   6. Put the part fully into a 70g/l CoMat 01-030 SODIUM CARBONATE Na2CO3 solution, at a temperature of 59 to 77 deg F (15 to 25 deg C) for 30 to 60 seconds, or put the part fully into the heavy duty alkali cleaner solution (refer to the SPM TASK 70-33-02-100-501 SUBTASK 70-33-02-100-001) or the medium duty alkali cleaner solution (refer to SUBTASK 70-33-02-100-003) for 30 to 60 seconds. Do this to make the remaining acid neutral. This step is not necessary if the part is to be put fully into an alkali solution to clean it.

   7. Clean the part in a flow of clean cold water.

   8. Put the part fully into CoMat 10-008 DEWATERING OIL (HOT) or CoMat 10-009 DEWATERING FLUID (COLD). Refer to the SPM TASK 70-38-05-380-501.

   9. If de-embrittlement heat treatment is necessary, do as follows.

      1. Clean the part in vapor to remove the grease, refer to the SPM TASK 70-11-01-300-503.

      2. Do the heat treatment procedure at a temperature of 374 to 410 deg F (190 to 210 deg C) for two hours. Do this unless different instructions are given in the applicable Engine Manual.

2. SUBTASK 70-33-17-300-002 Apply the Black Oxide Layer (Immersion Method)

   1. Clean the part, use the procedure given in the SPM TASK 70-11-14-300-503.

   2. Clean the part to remove the grease, use the procedure given in the SPM TASK 70-11-01-300-503.

   3. Put the part fully into the black oxide solution for 15 to 20 minutes. The solution temperature (at which it boils) must be between 280 to 289 deg F (138 to 143 deg C). Refer to SUBTASK 70-33-17-100-002 and SUBTASK 70-33-17-200-002. Clean the part immediately, refer to the subsequent step.

   4. Clean the part in clean cold water. Dry the part with dry compressed air.

   5. Remove all the loose particles with a soft bristle brush.

   6. Clean the part in clean cold water. Then put the part fully into hot water. Remove the part and dry it.

   7. Put the part fully into CoMat 10-008 DEWATERING OIL (HOT) or CoMat 10-009 DEWATERING FLUID (COLD) according to the manual rule.

3. SUBTASK 70-33-17-300-003 Examine the Layer of Black Oxide Finishing

   1. Examine the color of the surfaces of the part as follows.

      1. All the machined surfaces and the surfaces which have not had a case hardened treatment on them, will be very black.

      2. All the abrasive blasted surfaces will be slate grey.

      3. All the surfaces which have had a case hardened treatment will be mottled.

      4. Some parts could have a layer on the surfaces which is very plum colored.

   2. If the specified colors are not seen on the applicable part surfaces, you must remove the layer and apply it again.

   3. If there is a white material on the dried part, do as follows.

      1. Clean the part in a flow of cold water, to remove the white material.

      2. Put the part fully into hot water.

      3. Remove the part and dry it.

      4. Put the part fully into CoMat 10-008 DEWATERING OIL (HOT) or CoMat 10-009 DEWATERING FLUID (COLD). Refer to the SPM TASK 70-38-05-380-501.

   4. The satisfactory result of this task is that the oxide layer will keep oil in it. If this layer is removed to examine the part, it must be applied again immediately.

4. SUBTASK 70-33-17-300-004 Touch-up the Black Oxide Solution (Touch-up Method)

   1. Clean the part, use the procedure given in the SPM TASK 70-11-14-300-503.

   2. Use a brush to apply CoMat 01-428 DILUTE AQUEOUS ACID SOLUTION on to the areas to be touched up.

   3. Hold the part for 5 to 30 seconds at room temperature. Clean the part immediately, refer to step D.

   4. Clean the part in clean water and dry the part with compressed air.

   5. Put the part fully into CoMat 10-008 DEWATERING OIL (HOT) or CoMat 10-009 DEWATERING FLUID (COLD) according to the manual rules.

5. SUBTASK 70-33-17-300-005 Examine the Touched Up Surfaces

   1. Coating on polished surfaces will have a uniform, lustrous black color. Coating on non-polished surfaces will be black or dark grey in color and uniform areas of equivalent surface finish.

   2. Coating on all types of surfaces will be free from spots of red oxide or an overall reddish-brown color, but an overall reddish-brown cast on a basically black color is acceptable.

   3. Coating will not cause damage or degradation of existent coatings on steel parts.