SPOP 42 - Chromate Conversion Coating of Aluminum [PW11]

TASK 70-28-00-910-803-A
SPOP 42 - Chromate Conversion Coating of Aluminum

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

NOTE: Always obey the specific procedures and limits on the specific maintenance manual maintenance tasks. Do this task only when specified by the specific maintenance manual maintenance tasks.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	BRUSH - BRISTLED
No specific	1	CONTAINER 1 L (1/4 USGAL)
No specific	1	COTTON SWAB

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P05-028)	aluminum chromate conversion salts
(Material No.P05-029)	aluminum chromate conversion salts
(Material No.P05-030)	wetting agent
(Material No.P05-060)	demineralized water
(Material No.P05-061)	crocus cloth
(Material No.P05-062)	emery cloth

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping

3. Job Set-up
Subtask 70-28-00-860-050-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 70-28-00-910-050-A ** ON A/C NOT FOR ALL

A. Chromate Conversion Coating of Aluminum
(1) For repair of AMS 2473 parts, prepare approximately 1 pint or 16 oz (454 g) of the anodize touch-up solution A as follows:
(a) Put 8 oz (227 g) of demineralized water (Material No.P05-060) in a CONTAINER 1 L (1/4 USGAL).

NOTE: The demineralized water must have a chloride content of 10 PPM maximum.

(b) Add 0.5 oz (14.175 g) of aluminum chromate conversion salts (Material No.P05-029) into the CONTAINER 1 L (1/4 USGAL).
(c) Add 0.0085 oz (0.241 g) of wetting agent (Material No.P05-030) into the CONTAINER 1 L (1/4 USGAL).
(d) Mix the solution.
(e) Add 8 oz (227 g) more of demineralized water (Material No.P05-060) .

NOTE: The demineralized water must have a chloride content of 10 PPM maximum.

(f) Mix the solution.

NOTE: The working life of the anodize touch-up solution is 14 days. The solution must be identified as to the time and date of mixing.

(2) For the repair of AMS 2474 parts, prepare approximately 1 pint or 16 oz (454 g) of the anodize touch-up solution B as follows:
(a) Put 8 oz (227 g) of potable water in a clean CONTAINER 1 L (1/4 USGAL).
(b) Add 0.25 oz (7.087 g) of aluminum chromate conversion salts (Material No.P05-028) into the CONTAINER 1 L (1/4 USGAL).
(c) Mix the solution.
(d) Add 8 oz (227 g) of potable water.
(e) Mix the solution.

NOTE: The working life of the anodize touch-up solution is 14 days. The solution must be identified as to the time and date of mixing. Discard the solution after 14 days.

(3) Apply anodize touch-up solution A or B to the repair area as follows:
(a) Clean the repair area (Ref. AMM TASK 70-27-00-910-804).
1 If dirt and grease remain on the surface, use crocus cloth (Material No.P05-061) or emery cloth (Material No.P05-062) to clean the repair area.
(b) Apply the anodize touch-up solution to the repair area with a clean BRUSH - BRISTLED or COTTON SWAB.

NOTE: The anodize touch-up solution must wet the surface for approximately four minutes. If the solution does not wet the surface, remove the anodize touch-up solution with a clean cloth and apply again.

(c) Let the anodize solution air-dry.
(4) Examine the repair area for full coverage of the anodize touch-up solution.
(a) For anodize touch-up solution A, the color must be brown.
(b) For anodize touch-up solution B, the color must be iridescent gold to tan.
(5) Smooth the repair area with a lint-free cotton cloth (Material No.P05-005) .

[Rev.10 from 2021] 2026.04.01 02:20:34 UTC