Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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process is self limiting in that leaving the part in the emulsion for a longer peri- od of time will have no adverse effect, and the excess polymer will simply go back into the emulsion or be rinsed off. This process exhibits excellent adhesion (baked at 375°F for one-half hour and quenched in cold water and/or bending 180° to check for loss of adhesion), and other metals could easily be plated on a freshly formed electroless nickel–plated surface. As with the other metals, the parts can be rinsed, dried, and stored for sev- eral days and then be reactivated for plating by soaking in demineralized water for half an hour if so desired. In addition, the surface can be coated due to excellent paint adhesion characteristics. CONCLUSIONS The electrolytic deposition of a thin film of various polyamides and/or polyamines on the surface of a magnesium, aluminum, or titanium surface and their alloys will allow the metals to be easily and quickly plated with other metals. This can be accomplished with far less difficulty than via the application of a thin film of zinc or tin by the use of a zincate or a stannate. NOTES 1. Hewitson, E.H. (Eastman Kodak Co. ). U.S. Patent 1,627,900 (1927). 2. Korplum, J. (Schering–Kahlbaum). U.S. Patent 2,142,564 (1939). 3. Wernick, S., Pinner, R, Sheasby, P.G. The Surface Treatment and Finishing of Aluminum and its Alloys. Metals Park, OH: ASM International, 1987, pp. 1023–53. 4. Wernick, S., Pinner, R, Sheasby, P.G. The Surface Treatment and Finishing of Aluminum and its Alloys. Metals Park, OH: ASM International, 1987, p. 1054. 5. Dow Chemical Company, U.S.A., Inorganic Chemicals Dept. Operations in Magnesium Finishing, 1982. 6. Wernick, S., Pinner, R, Sheasby, P.G. The Surface Treatment and Finishing of Aluminum and its Alloys. Metals Park, OH: ASM International, 1987, pp. 1055–8. 7. Perform a Google search on "plating + onto + titanium + patents." AESF, an officer of ASTM and a member of ACS. 166

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