oa Stress in Electrodeposited Rhodium

In the electrodeposition of rhodium from the sulphate bath normally employed highly stressed deposits are produced. In this paper the author describes an investigation of the effects of contamination by organic compounds contained in masking paints on these stresses, and shows that the results of earlier studies on internal stress may have been vitiated by the employment of a method relying on such paints for masking one side of the cathode. An apparatus completely avoiding the use of paint was designed in the course of the present investigation, and an improved paint, giving markedly less contamination and lower stresses in the deposit, was formulated for use in commercial rhodium plating practice.