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 WHEN YOU
MEASURE IN (mm or cm)
FACTOR WHEN YOU
MEASURE IN (in)
Cadmium alkaline solution 0.488 80
Cadmium acid solution 0.488 80
Table 004 - Specific Plating Factor
- Example: You have to plate an area of 25 cm² (3.875 in²) with cadmium alkaline solution.
The required thickness is 0.015 mm. The correct ampere-hours setting is: 0.488 x 0.015 x
25 = 0.183 ampere-hours
- Example: 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.in Determine the
correct number of ampere-hours as follows: 80 x 0.0006 x 3.87 = 0.183 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.
5 Procedure for non stainless steel
a
b
Remove all grease from the repair area with a clean cloth soaked in trichloroethane
(Material No. 11-026 ).
When the cleaning agent has evaporated, mask off all areas which are not to be treated.
WARNING: CLEANING AND DEOXIDIZING SOLUTION IS HARMFUL.
c
d
With a prepared tampon apply the cleaning and deoxidizing solution (Item 1 in the
Table of Subsidiary Materials). Do this at cathodic plating polarity (see manufacturer's
instructions) and 10 to 12 volts. Move the tampon in contact and over the surface until
you get a regular clean surface which is free from water breaks. This should take about 5
to 10 seconds per square inch (6.5 cm² (1.007 in²)).
Rinse the area with clean cold running water.
WARNING: CADMIUM ALKALINE SOLUTION IS DANGEROUS.
e
With a prepared tampon apply the cadmium alkaline solution (Item 9 in the Table of
Subsidiary Materials). Do this at cathodic plating polarity and 8 to 12 volts. Move the
tampon in contact with and over the surface until you get the required thickness. You
should move the tampon at a speed of approximately 10 to 38 cm (4 to 15 in) per
second.
NOTE: For unspecified thickness, the deposit must average between 0.015 mm (0.0006
in) and a minimum of 0.01 mm (0.0004 in), refer to Paragraph 2.B.(1).(d).3 .
f
g
Rinse the area with clean cold running water.
Abrade slightly the treated surface with a Scotch-brite pad or aluminum oxide and
cotton wool. It will brighten the cadmium deposit before passivation and improve its
appearance.
WARNING: CADMIUM/ZINC PASSIVATING SOLUTION IS HARMFUL.
Print Date: December 29, 2016 Page 9 of 29
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