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 : h i Apply passivation solution (Item 2 in the Table of Subsidiary Materials) with a brush or swab to the plated surface. Allow the solution to remain in contact for 5 to 10 seconds until a yellow or gold appearance is obtained. Rinse the area with clean cold running water. CAUTION: THE PASSIVATED FILM IS RELATIVELY FRAGILE UNTIL DRY. AVOID TOUCHING IT BEFORE THE RELEVANT STEP IS COMPLETED. j Dry the repair area with a hot-air dryer at a maximum temperature of 50° C (122° F). NOTE: If step 2.B.(1).(d).5.j is impracticable, rinse with hot water to aid drying and gently dab the surface with soft clean tissues or clean cotton wool until the surface is dry. k Inspect the treated area as described in Paragraph 2.B.(1).(d).4 . NOTE: Make sure that the required paint coatings are applied within 16 hours. 6 Procedure for Stainless Steel a Do the steps 2.B.(1).(d).5.a to 2.B.(1).(d).5.d . WARNING: ETCH/ACTIVATOR SOLUTION NUMBER 4 IS HARMFUL. b c With a prepared tampon apply the etching solution (Item 12 in the Table of Subsidiary Materials). Do this at a reversed polarity (anodically, see manufacturer's instructions) and 10 to 14 volts. Move the tampon in contact with and over the complete surface concerned. Continue until an evenly etched and smutted appearance is obtained. Rinse the area with clean cold running water. WARNING: ETCH/ACTIVATOR SOLUTION NUMBER 3 IS HARMFUL. d e With a prepared tampon apply the etching solution (Item 13 in the Table of Subsidiary Materials). Do this at a reversed polarity (anodically, see manufacturer's instructions) and 10 to 12 volts. Move the tampon in contact with and over the complete surface concerned until the surface will not lighten further. Rinse the area with clean cold running water. WARNING: ETCH/ACTIVATOR SOLUTION NUMBER 4 IS HARMFUL. f With a prepared tampon apply the etching solution (Item 12 in the Table of Subsidiary Materials). Do this at cathodically polarity (see manufacturer's instructions) and 10 to 12 volts. Move the tampon in contact with and over the complete surface concerned for 2 to 3 seconds per square inch (6.5 cm² (1.007 in²)). WARNING: NICKEL EPAIS SOLUTION IS DANGEROUS. g Move the tampon with nickel epais solution (Item 11 in the Table of Subsidiary Materials) over the moistened area at cathodically plating polarity (see manufacturer's instructions) and 6 to 10 volts, until 0.0025 mm (0.0001 in) has been deposited, refer to Paragraph 2.B.(1).(d).3 . Print Date: December 29, 2016 Page 10 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 : NOTE: Move the tampon at about 10 to 25 cm (4 to 10 in) per second. h Rinse the area with clean cold running water. WARNING: CADMIUM ACID SOLUTION IS DANGEROUS. i With a prepared tampon apply the cadmium acid solution (Item 10 in the Table of the Subsidiary Materials). Do this at the plating polarity (see manufacturer's instruction) and 8 to 10 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 15 to 61 cm (6 to 24 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 . j Do steps 2.B.(1).(d).5.f thru 2.B.(1).(d).5.k . (e) Cadmium brush plating (or pad cadmium plating DALIC process) for steels (excluding stainless steels) with a maximum tensile strength of 1420 N/mm² (205 KSI). NOTE: This process is to be used to repair damaged protective treatment film not exceeding 700 mm² (1.085 in²). The process is not allowed on any steel with carburized areas For larger surface perform multiple repairs. This process must be carried out by trained and approved personnel. An operator training service is available from the solution suppliers. 1 Equipment - Power supply: Variable rectifier 30 volt 20 amp minimum fitted with voltmeter, ammeter, ampere hour meter, reversing switch and on/off switch. - Dishes for solutions glass polyethylene or porcelain flat bottom dishes of convenient size. - Electrodes: Use DALIC or DALIC UK or SIFCO tampons which have to be prepared in accordance with the material manufacturer's instructions. For optimum deposit speed area and shape of the anode must be determined by the area and the shape of the part to be plated the size should be s/6 < S < s/3 for SIFCO solution and s/8 < S < s/5 for DALIC solution where "s" is the area to be treated and "S" the area of the anode. - Hot air dryer (oil free). 2 Repair Materials ITEM NOMENCLATURE QTY MATERIAL/REMARKS 1 Cleaning Agent AR Material No. 11-003 or 11-026 (Refer to CML) 2 Lint free cloth, cotton wool AR Local Purchase 3 Abrasive Paper - Silicon Carbide (grade 120) 4 Abrasive Paper - Aluminum Oxide AR Local Purchase (grade 320 - water resistant) or finer or red SCOTCH-BRITE pads 5 Masking tape AR PVC insulating tape or 3M No. 470 or aluminum tape Material No. 08-052 (Refer to CML) 6 Brush or Swab AR Local Purchase Print Date: December 29, 2016 Page 11 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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