DMC:V2500-00-70-33-20-00A-081A-DIssue No:001.00Issue Date:2013-03-20
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 70-33-20-100-501 Make-Up Of The Anodic Coatings For Aluminum Base Alloys - Chromic Acid Process
Safety Precautions
Chromic acid solutions
NOTE
To identify the consumable materials refer to the PCI.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
NONEConsumables, Materials and Expendables
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| CoMat 01-023 CHROMIUM TRIOXIDE CrO3(CHROM.ACID) | LOCAL | CoMat 01-023 | ||
| CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER | LOCAL | CoMat 01-201 | ||
| CoMat 01-047 POTASSIUM DICHROMATE K2Cr2O7 | LOCAL | CoMat 01-047 |
Spares
NONESafety Requirements
WARNING
CHROMIC ACID IS VERY DANGEROUS. IF BREATHED, IT WILL CAUSE ULCERS IN THE NOSE AND IT CAN CAUSE DAMAGE TO THE NASAL SEPTUM. CHROMIC ACID SALTS AND SOLUTIONS, THAT TOUCH THE SKIN, CAN CAUSE CHROME SORES. THEY CAN ALSO CAUSE ULCERS, IF THEY GET INTO CUTS AND ABRASIONS.
WARNING
THE CHROMIUM ACID BATH MUST NOT BE USED, UNLESS THE FUME EXTRACTOR IS OPERATED AND IS FULLY SERVICEABLE.
WARNING
A RECOMMENDED BARRIER CREAM MUST ALWAYS BE APPLIED, TO THE HANDS AND FOREARMS, BEFORE WORK IS STARTED.
WARNING
PROTECTIVE CLOTHING MUST ALWAYS BE WORN.
WARNING
DO NOT EAT OR SMOKE, NEAR THE CHROMIUM PLATING BATH.
WARNING
IF CUTS AND ABRASIONS DO NOT HEAL SATISFACTORILY, TELL THE MEDICAL DEPARTMENT.
WARNING
CHROMIC ACID SOLUTION CAUSES OXIDATION AND IS A FIRE RISK, BECAUSE OF THE POSSIBLE SPONTANEOUS COMBUSTION OF ORGANIC MATERIALS - (SUCH AS CLOTH AND WOOD), SOAKED BY THE SOLUTION. SUCH DIRTY MATERIALS MUST BE SOAKED IN SODIUM BISULPHATE SOLUTION TO MAKE NEUTRAL THE CHROMIC ACID, THE SOLUTION MUST THEN BE DISCARDED AS A SPECIAL UNWANTED MATERIAL. THE SOLID MATERIAL MUST THEN BE FLUSHED WITH WATER BEFORE IT IS DISCARDED
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 TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.
Procedure
NOTE
The purity of the chromium trioxide must be at least 99.5 percent.The solution is made-up of 6.4 oz/gal (40 g/l) of CoMat 01-023 CHROMIUM TRIOXIDE CrO3(CHROM.ACID) in CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER.
Composition.
The solution is contained in a mild-steel tank; with heating and cooling coils or jackets, rectifier, agitation and extraction facilities. A mild or stainless-steel cathode is used, in the form of a plate or the tank itself. The anode/cathode area ratio is not critical, but a ratio of 5:1 to 10:1 is suitable. Less chromic acid is consumed at the higher ratio.
Operation.
SUBTASK 70-33-20-100-001 Make-up of the Chromic Anodizing Solution
The solution is aqueous and is made-up of 6.4 oz/gal (40 g/l) of CoMat 01-047 POTASSIUM DICHROMATE K2Cr2O7 in CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER.
Composition.
SUBTASK 70-33-20-100-002 Make-up of the Dichromate Sealing Solution