What are the corrosion-resistant materials used in electroplating equipment?

The electroplating process is essentially the same as bath plating, involving the crystallization of metal ions in a solution on a negative electrode (the workpiece). However, compared to bath plating, brush plating and casting processes are much faster, resulting in the plated surface not being a complete crystallization of metal ions, but rather a transient crystallization of the plated surface at specific points.

Thus, brush plating has its own unique technical application. Brush plating is a unique electroplating process that does not require a plating bath. Instead, the surface of the product or workpiece is brushed with a plating brush to form the plated layer. Therefore, brush plating is also known as rapid plating, bathless plating, or metal plating.

Common corrosion-resistant materials include titanium, lead, polyethylene, polypropylene, and polytetrafluoroethylene. Titanium has excellent passivation properties and is very stable in various concentrations of sodium cyanide and chromic acid. It also exhibits high corrosion resistance in most organic and inorganic acid solutions. However, it is more susceptible to corrosion by hydrochloric acid. Titanium is widely used in electroplating applications, such as titanium hangers, titanium heating tubes, titanium electroplating tanks, and titanium anodes. The primary reason for lead's corrosion resistance is the low solubility of the rusting compounds it forms in some saturated solutions. Lead is primarily used as a corrosion inhibitor for sulfuric acid compounds, as the resulting lead sulfate is poorly soluble in hydrochloric acid.

Lead forms a corresponding rusting compound in chromic acid with a concentration of less than 40%, calcium carbonate with a concentration of less than 90%, and sulfuric acid with a concentration of less than 50% without aeration, providing excellent protection. Stainless steel is typically plated in lead-lined tanks.