The main reasons for the matte spots on steel pipes after electroplating include:
- Unclear degreasing: The oil, dust, and other organic impurities on the surface of the substrate have not been thoroughly cleaned, which directly affects the adhesion and uniformity of the coating, resulting in the inability to form a uniform deposition layer, causing the spot phenomenon.
- Using the wrong brightener: If the brightener fails, the formula is wrong or the quality does not meet the standard, the glossiness and uniformity of the coating surface will be insufficient, causing spot failure.
- Out-of-control of the composition of the plating solution: If the concentration of the nickel source, reducing agent, pH buffer, and other additives is unstable, it will affect the quality of the coating and cause spotting.
- Improper temperature control: Too high or too low temperature will affect the chemical reaction rate and the quality of the coating, resulting in spotting.
- Insufficient stirring: Impurities in the plating solution will cause uneven or spotting coating. Proper stirring can ensure uniform distribution of chemical components.
- Substrate treatment problems: Grease, scale, or other contaminants on the surface of the substrate can cause uneven coating and flowery coating. Optimizing the cleaning and activation steps can avoid these problems.
- Improper post-treatment: Improper handling of the rinsing, drying, and baking processes can also cause flowery coating. It is key to ensure that each step follows the correct process flow.
Solutions include:
- Strict degreasing treatment: Use a good degreasing agent to ensure that the surface of the substrate is thoroughly degreased, strengthen the cleaning process, and remove residual oil and impurities on the surface through ultrasonic cleaning or multiple water washing.
- Correct use of brightener: Select a brightener with the appropriate formula and reliable quality, regularly test the brightener ingredients, and replace them in time when problems are found to ensure their activity and effect.
- Control the composition of the plating solution: Regularly analyze and replenish the main ingredients in the plating solution, adjust the concentration of the reducing agent, maintain a suitable pH value, stabilize the temperature of the plating solution, ensure that the filtration system works properly, and regularly replace the filter medium.
- Optimize substrate treatment: Thoroughly clean and activate the substrate surface, remove grease, scale, and other contaminants, and ensure that the substrate surface is suitable for nickel plating.
- Pay attention to post-processing: Make sure the rinsing, drying, and baking processes follow the correct process to avoid blooming.
Post time: Sep-30-2024