Effect of organic additives in electrolytes on internal stresses in electrodeposited iron

Abstract

1. In the presence of small quantities of certain organic additives, it is possible to obtain dense, smooth bright iron deposits from cold sulfate-chloride baths. The deposits have an increased resistance to corrosion, are non-magnetic, and contain both sulfur and carbon. 2. Organic additives have a substantial effect on internal stresses in electrodeposited iron. There are two characteristic kinds of dependence of internal stresses on the additive concentration, one with a maximum at a low additive concentration, and the other with a minimum at a moderate concentration. 3. There is no obvious correlation between internal stresses and cathodic polarization of iron in electrolytes containing organic additives. 4. The effect of organic additives on internal stresses in electrodeposited iron is associated with physical adsorption of the additive on the cathode surface and their occlusion in the deposit, and can be explained in the framework of the dislocation-sorption theory of internal stresses.