Introduction to Five Coloring Methods for Anti-corrosion Steel Pipes
Release time:
2020-07-20
Chemical oxidation coloring involves forming the color of a film through chemical oxidation in a specific solution. Common methods include the dichromate method, the mixed sodium salt method, the sulfidation method, the acidic oxidation method, and the alkaline oxidation method. Among these, the "INCO method" is widely used. However, to ensure consistent coloration across an entire batch of products, it is essential to use a reference electrode for control.
Surface mirror-polishing treatment for anti-corrosion steel pipes: Depending on the complexity of the anti-corrosion steel pipe product and specific user requirements, methods such as mechanical polishing, chemical polishing, and electrochemical polishing can be employed individually to achieve a mirror-like luster. The following are several methods for coloring anti-corrosion steel pipes:
1. Chemical oxidation coloring: This method involves forming the color of a film through chemical oxidation in a specific solution. Common techniques include the dichromate method, the mixed sodium salt method, the sulfidation method, the acidic oxidation method, and the alkaline oxidation method. The "INCO method" is generally used more frequently; however, to ensure consistent coloration across an entire batch of products, it is essential to use a reference electrode for control.
2. Electrochemical oxidation coloring: This method involves forming the color of a film through electrochemical oxidation in a specific solution.
3. Ion-deposition oxide coloring method: This involves placing stainless steel workpieces into a vacuum coating machine for vacuum evaporation coating. For example, watch cases and straps coated with titanium gold typically have a golden-yellow appearance. This method is suitable for mass production of products. However, due to the high initial investment and costs, it is not economically viable for small-batch production.
4. High-temperature oxidation coloring: In this process, the workpiece is immersed in a specific molten salt and maintained under precise process parameters, allowing it to develop an oxide film of a certain thickness and exhibit a variety of different colors.
5. Gas-phase pyrolysis coloring method. This method is relatively complex and finds limited application in industry.
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