Causes of electroplating anode slime and application of electroplating auxiliary anode and electroplating insoluble anode

Causes of electroplating anode slime and application of electroplating auxiliary anode and electroplating insoluble anode

 

First, the production of electroplating anode slime

Auxiliary anodes are used in electroplating. Traditional methods are mostly soluble anodes. For example, when nickel plating is used, metal nickel anodes are used. In the industries such as chromium plating and galvanization, anodes such as chromium anodes and zinc anodes are used. In the electrolytic process, soluble anodes are used. After losing the electrons, it will dissolve into the solution, but the inactive impurities on the anode will not lose the electrons, but will sink into the bottom of the electrolytic cell together with other metal ion impurities in the form of small particles to form anode sludge. Because the anode mud contains metal ions and other impurities to contaminate the plating solution, this phenomenon often causes pitting and black spots on the plating layer, which affects the apparent quality of the plating layer.

Electroplated anode slime

 

Second, the application of electroplating auxiliary anode insoluble anode materials

 

不 Insoluble anode auxiliary anode for electroplating means that the anode itself will not dissolve when the current is passed.

 

的 Anode materials that only undergo oxidation reactions can pass a larger current density without generating a passivation film and will not produce anode mud. Insoluble anode materials commonly used in electroplating are: lead and alloys (soluble anodes in lead plating), platinum, stainless steel, titanium-based platinum plating, graphite, etc.

 

Third, the use of insoluble titanium-based oxide coating characteristics

 

Traditionally used insoluble anode materials platinum, graphite and lead alloy anodes, because platinum is expensive, graphite and lead alloy anodes dissolve during high current electrolysis, poor corrosion resistance, large oxygen evolution overpotential, low electrochemical performance, and low energy consumption. Large, especially the toxic lead in the anode will dissolve in the solution, cause pollution, affect the cathode process and other factors. It is a problem that needs to be improved and upgraded in the electroplating operation.

 

In recent years, metal mixed oxide electrodes, as catalysts for electrochemical reactions, are a new type of insoluble anode material developed, often referred to as metal-coated electrodes.

 

At present, the research on insoluble anodes has attracted the most attention from graphite and coated titanium anodes. In particular, the application of oxide-coated titanium anodes, because of their good electrocatalytic activity, long service life, strong corrosion resistance, and environmentally friendly materials, are increasingly used as auxiliary anodes in the electroplating industry. .