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 : - Cathodically etch with solution ACTIVATOR No. 1 SCM 4200 (Item 20) at 8 to 15 volts forward current. - Do not allow to dry. Plate without delay a layer of nickel using plating solution (Item 18) at 6 to 10 volts for the ampere minutes required to obtain 5 microns (2 to 7 microns). - Rinse with de-mineralized water. - Do not allow to dry. Before switching on the current, wipe the area to be treated with a pad dampened with the plating solution (Item 15) or soak a tampon with the plating solution and start the appropriate tampon movement over the plating area. - Using a prepared tampon move the tampon and apply plating solution at forward current or cathodic plating polarity ( part (-) and tool (+)) see manufacturer's instructions (Item 15). Plate at 8 V and move the tampon in contact and over the surface and until you get the required thickness (for required ampere-hours refer to Paragraph 2.B.(1).(f).5.e . During plating move the tampon at a speed of approximately 6-24 m/min or 20-80 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).(f).3 ). - Rinse the area with cold running water. - If required for appearance abrade slightly the treated surface with a SCOTCH-BRITE pad or aluminum oxide and cotton wool. It will brighten the cadmium deposit before passivation. - Apply passivating solution (Item 16) with a brush or swab to the plated surface. Allow the solution to remain in contact until a yellow or gold appearance is obtained. - Rinse the area with clean cold running water. - Dry the repair area with an air blast or with a hot air dryer at a maximum temperature of 50° C (122° F) or gently dab the surface with soft clean tissues or absorbent paper or clean cotton wool. - Inspect the treated area as described in Paragraph 2.B.(1).(e).5.d . NOTE: Make sure that the required paint coatings are applied within 16 hours. NOTE: Do not return used solutions in original containers. The solutions, rinsing water and used bonnets must be processed within the firm or destroyed by an approved organization. Contaminated packaging if not re-used with the same product is also special waste to be sent to an approved organization for recycling or disposal e DALIC Solution 2023 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 (220 grade), feather the edges as shown on Figure 001 . Clean with demineralized water and several cloths or papers without drying the surface. - Manually abrade the area using a water wetted red abrasive sponge, clean with demineralized water and several cloths or papers without drying the surface. Print Date: December 29, 2016 Page 18 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 : (2). Phosphating (a) General - Manually abrade the area using alumina powder and a wetted cotton wool piece, clean carefully with demineralized water and several cloths or papers without drying the surface. The surface in final must be free from residues. NOTE: Before switching on the current, wipe the area to be treated with a tampon soaked with the indicated solution (Item 12) and start the appropriate tampon movement over the plating area. - Etch with ATTAQUE No. 3 Solution at 11 V, reverse polarity (part (+) and tool (-)), apply 0.25 Ah/dm² of area to be treated. - Rinse with de-mineralized water. - Etch for cleaning with ATTAQUE No. 2 solution (Item 13) at 11 V, reverse polarity (part (+) and tool (-)), apply 0.25 Ah/dm² of area to be treated. - Rinse with de-mineralized water. - Plate a nickel under layer with the NICKELAGE EP Solution (Item 14) at 6 to 10V, cathodic plating polarity or forward current (part (-) and tool (+)), for the ampere minutes required to obtain 5 microns (2 to 7 microns). - Rinse with de-mineralized water. - Plate around 3 µm cadmium with CADMIUM 2023 solution (Item 10) at 6 V, cathodic plating polarity or forward current (part (-) and tool (+)) then increase to 8 V to achieve the required thickness (see the required ampere-hours in Paragraph 2.B.(1).(f).5.e . During plating move the tampon at a speed of approximately 6 to 24 m/min or 20 to 80 feet/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).(f).5.e . - Rinse the area with clean cold running water. - Apply passivating solution (Item 11) with a piece of cotton wool. Do soft and regular movements on the plated surface for 15 to 30 seconds until a yellow or gold colour is obtained. - Rinse the area with clean cold running water. - Dry the repair area with an air blast or with a hot air dryer at a maximum temperature of 50° C (122° F). - Inspect the repair as described in Paragraph 2.B.(1).(e).5.d . NOTE: Make sure that the required paint coatings are applied within 16 hours. NOTE: Do not return used solutions in original containers. These solutions, rinsing water and used bonnets must be disposed by an approved organization. Contaminated packaging if not re-used with the same product is also special waste to be sent to an approved organization for recycling or disposal. 1 The phosphorisation is a procedure in which the surface of the metal is given a layer of phosphoric acid solution. You do this with a brush when the parts are installed or you can put them into a phospheric bath. 2 This protective treatment is necessary after the removal of corrosion or when a repair procedure breaks the original surface protection. All corrosion and the paint coatings must be removed until a clean metallic surface is obtained, before you start with phosphating. Before brush phosphating, the corrosion can be removed mechanically. When the parts are Print Date: December 29, 2016 Page 19 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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