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

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Customer : ENV Type : A320 Rev. Date : Nov 01, 2016 51-21-11 Application of Protective Treatment to Metal Parts Manual : SRM Selected effectivity : (c) Cadmium Plating (Immersion Procedure) 1 For details of this cadmium-plating procedure and the necessary equipment refer to PMS Chapter 01-02-02 . (d) Cadmium Plating ('DALIC' Process) for steel with a maximum tensile strength of 1100 N/mm ² (159 KSI). NOTE: Alternative procedures given in Paragraph 2.B.(1).(e) for steels and in Paragraph 2.B.(1). (f) for stainless steels. 1 Materials and Equipment Contact AIRBUS to obtain the reference source for the 'DALIC' materials. NOTE: For the power supply you need a 'DALIC' rectifier. Dishes for the solutions must be made out of glass, polythene or porcelain material. For electrodes use 'DALIC' tampons which have to be prepared in accordance with the material manufacturer's instructions. 2 Subsidiary Materials ITEM NOMENCLATURE QTY MATERIAL/REMARKS 1 'DALIC' cleaning and deoxidizing - solution 2 'DALIC' cadmium/zinc passivating - solution 3 Trichloroethane - Material No. 11-026 (Refer to CML) 4 Lint-free cloth - 5 'DALIC' membrane - 6 Masking tape - 7 Brush or swab - 8 Hot-air dryer - 9 'DALIC' cadmium alkaline solution - 10 'DALIC' cadmium acid solution - For all materials refer to the 'DALIC' instruction manual 11 'DALIC' nickel epais solution - 12 'DALIC' etch/activator solution - Number 4 13 'DALIC' etch/activator solution - Number 3 14 Aluminum oxide powder or Scotch-brite pads - 3 How to Obtain the Correct Thickness The thickness of the deposited metal is controlled by the ampere-hour meter. It further depends upon the area to be plated and the specific plating factor. The specific plating factor gives the number of ampere hours required to produce a deposit in mm or inches onto a surface area of square centimeters or square inches. SOLUTION FACTOR WHEN YOU FACTOR WHEN YOU MEASURE IN (mm or cm) MEASURE IN (in) Nickel epais solution 1.282 210 Print Date: December 29, 2016 Page 8 of 29 © AIRBUS S.A.S. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
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 © AIRBUS S.A.S. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
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A 320 SRM 51-21-11 APLICATION OF PROTECTIVE TREATMENT TO METAL PARTS

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