A 320 SRM 51-21-11 APLICATION OF PROTECTIVE TREATMENT TO METAL PARTS

Customer : ENV
Type : A320
Rev. Date : Nov 01, 2016
51-21-11 Application of Protective Treatment to Metal Parts
Manual : SRM
Selected effectivity :
SOLUTION
FACTOR FOR MEASURE-
MENT
IN (mm)
SIFCO SPS 5070 0.4 70
NICKEL EP/EPAIS 1.78 290
Nickel SPS 5600 1.5 250
FACTOR FOR MEASURE-
MENT
IN (in)
Table 006
Example 1:
You have to plate an area of 25 cm² (3.875 in²) with SPS 5070 cadmium LHE plating
solution. The required thickness is 0.015 mm, the correct ampere hours setting is: 0.4 x
0.015 x 25 = 0.15 ampere-hours.
Example 2:
You have to plate the same area with the same thickness, but you measure in inches. The
thickness is 0.0006 in and the area has the size of 3.87 sq.inch. Determine the correct
number of ampere hours as follows: 70 x 0.0006 x 3.87 = 0.162 ampere-hours.
4 Inspection
The cadmium deposit must be fine grain, smooth and free from blisters, pitting, burns and
other defects. Ensure that the cadmium deposit has good adherence to the metal surface.
Check this with an adhesive tape. Put a strip of adhesive tape onto the treated surface and
draw it quickly away. The adhesive tape must be free from cadmium particles. Refer to PMS
Chapter 01-02-21 for more information.
5 Procedure
a
b
c
Remove all grease from the repair area (minimum one inch outside the repair area) with
a clean cloth soaked in cleaning agent (Material No. 11-003 or 11-026 ) and wipe dry
with a clean cloth or absorbent paper.
Mask as necessary to define the area to be plated. If the area was already plated with
cadmium, the brush plating must overlap the existing cadmium by about 4 mm (0.157
in), refer to Figure 001 .
Brush Plating Procedure
Use one of the alternative procedures given in Paragraph 2.B.(1).(f).5.d and 2.B.(1).
(f).5.e .
d SIFCO Solution SPS 5070
NOTE: Prepare the work place with all the tools and solutions.
Use a different and identified tool for each solution.
First wet with demineralised water the bonnets set on the plating tools then
squeeze with hand and paper and let soak with solution for a minimum of 2
minutes.
The treatment must be achieved in totality without interruption.
- Manually abrade the area to be plated using a water wetted abrasive paper (320
grade or finer) or fine SCOTCH-BRITE pad and water or aluminum oxide powder on a
water moistened swab. Feather the edge as shown on Figure 001 .
- Rinse with demineralized water.
- Electrolytically clean with deoxidizing solution (Item 27) at 10 to 20 volts forward
current.
- Rinse with demineralized water ensuring a water break free surface.
- Anodically etch with solution ACTIVATOR No. 4 SCM 4250 (Item 19) at 8 to 15 volts
reverse current.
- Rinse with demineralized water.
Print Date: December 29, 2016 Page 17 of 29
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