Method of pickling articles of copper and metals less noble than copper

摘要

Articles of copper and brass can be uniformly pickled in a solution utilizing peroxosulfate as the active agent when the concentration of additives in the form of organic sulfur compounds, inorganic sulfur compounds, organic sulfur-free nitrogen compounds, and inorganic sulfur-free nitrogen compounds are increased to increase the current yield, when the speed of the solution of less noble metals than copper is inhibited and when an organic complex former is added to the pickle.