Items such as mechanical parts in special screws that have pronounced conditions to prevent corrosion and a method to obtain Articles

摘要

1413180 Electro-plating a fastener MIDWEST CHROME PROCESS CO 19 April 1973 [3 May 1972] 19097/73 Addition to 1408285 Heading C7B [Also in Divisions B3 and F2 A modification or an improvement of the fastener of Specification 1408285 comprises coating the fastener with a layer of thickness 0.000005 to 0.0002 inches of at least one material of the group consisting of a Sn/Ni alloy, a Sn/Co alloy, or a Sn/Ni/Co alloy. The layer may be applied by an acid electrolytic coating bath, e.g. SnCl 2 , NiCl 2 .6H 2 O, ammonium bifluoride, and ammonium hydroxide to a pH of 2.5. The operating temperature of the bath is 150‹F Œ 5‹ with a c.d. of 15 to 20 amps/square foot.