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 :
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. For more
information refer to PMS Chapter 01-02-21 .
5 Procedure
a
b
c
d
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).(e).5.d and 2.B.(1).
(e).5.e .
Using SIFCO solutions
NOTE: Prepare the work place with all the items. Start the power pack, adjust the
voltage to 20 V and the current to the maximum and ensure the power pack is
set in 'forward' polarity. Set the bonnet on the plating tool. Wet it first with demineralised
water, squeeze with hand and paper, then place the electrode in the
cadmium solution.
- Manually abrade the area to be plated using a water wetted abrasive paper (320
grade or finer) or fine SCOTCH-BRITE pad and water. Feather the edge as shown on
Figure 001 .
- Rinse with demineralized water. Wipe with a clean wet cloth and wipe dry with a clean
cloth.
- Before switching on the current, wipe the area to be treated with a pad dampened
with the plating solution (Item 12) or soak a tampon with the plating solution and start
the appropriate tampon movement over the plating area. Ensure you have a liquid
break free condition otherwise repeat 2.B.(1).(e).5.d Paragraph 2.
- Using a prepared tampon move the tampon and apply plating solution at forward
current cathodic plating polarity (part connected to (-) terminal and electrode (+) see
manufacturer's instructions), plate at 15 to 20 V until a visible layer of cadmium is
deposited, then reduce voltage to 8 to 14 V. Move the tampon in contact and over the
surface and until you get the required thickness (see the required ampere hours in
Paragraph 2.B.(1).(e).4 at a speed of approximately 6 to 24 m/min or 20 to 80 feet per
minute. During plating do not allow the surface to dry and move the tampon to avoid
the deposit to darken (burning).
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).(e).4 .
- Rinse the area with clean cold running water.
- Apply passivating solution (Item 13) with a brush or swab to the plated surface.
Allow the solution to remain in contact for 15 to 30 seconds until a yellow or gold
appearance is obtained.
Print Date: December 29, 2016 Page 13 of 29
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