By J.K. Dennis and T.E. Such (Auth.)

Over the past decade the engineering purposes for nickel and chromium coatings have received in significance. during this 3rd version the bankruptcy facing engineering functions has been up to date and improved to incorporate additional information on electroforming and composite coatings, and engineering purposes were emphasized within the additions to the bankruptcy on autocatalytic deposition of nickel. Additions were made to the sections on pulse plating and use or rotating cathodes, and the part on trivalent chromium has been prolonged

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Additional info for Nickel and Chromium Plating

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This solution is used to apply a strike plate onto certain metals which tend to have a passive surface due to a natural oxide film, such as stainless steel and other nickel alloys, prior to those metals being subsequently electroplated in standard baths. Nickel anodes are generally employed but care must be taken to avoid a rapid increase in nickel ions in solution which is caused by the large difference between the anode and cathode efficiencies of this highly acid bath. Nickel sulphamate bath Small volumes of plating solutions based on nickel salts other than nickel sulphate and nickel chloride are used for certain purposes and the com- Electroplating baths and anodes used for industrial nickel deposition 45 monest of these is the nickel sulphamate [Ni(NH2S03)2] solution12.

5 also shows the problems encountered in illustrating a representative region of a deposit plated under particular conditions. The electron micrographs shown in Fig. 5(c) and (d) were taken from adjacent areas of the same foil. Electron microscopy definitely shows that electrodeposited nickel is twinned and that dislocations are present. The traditional Watts bath (300 g/l NiS04. 6H20, 36 g/l NiC12. 6H20 and 40g/l H3B03) produces a deposit which at 4A/dm2 has a less uniform grain size than that obtained from a Watts bath containing the equivalent concentration of chloride ion but present in the form of sodium chloride.

48, 32 (1961) 4. , Electroplating and Metal Finishing, 27 (6). 18 (1974) 5. R. , Metal Finishing, 71 (lo), 55 ( 1973) 6. WEIL, R. , Metal Finishing, 53 (11). 60 (1955) 7. S. , Specimen Preparation for Electron Microscopy, Blackwell Scientific Publications (1966) 8. K. , Electroplating & Metal Finishing, 20 (12), 376 (1967) and 21 (I), 16 (1968) 9. H. , Trans. Inst. Metal Finishing, 44, 105 (1966) 10. I. , J . Electrodepositors’ Tech. , 27, 215 (1951) 11. SARD, R. , Chapter 1 in Properties of Electrodeposits, Their Measurement and Significance (ed.

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