|Material:||Steel Or Copper||Coating Type:||Zinc，nickel，tin，copper And Alloy|
|Barrel Loading Capacity:||20~200kg||Coating Thickness:||According To Customer|
Zinc Coating Barrel Plating Line,
200kg Copper Barrel Plating Line,
Steel Electroplating Barrel Machine
|Common faults||Cause of occurrence||Solution|
|Pitting on the coating||Organic impurities in the plating solution||Adsorption with activated carbon|
|Lack of wetting agent||Add wetting agent 0.5-1ml/l|
|High or low pH value||Adjust PH to specification with dilute sulfuric acid or dilute sodium hydroxide solution|
|Iron impurities in the plating solution||Plating solution treatment|
|Bright coating with local matte (foggy)||Copper impurities in the plating solution||Removing Copper Impurities by Electrolysis|
|Insufficient brightener||Adding brightener|
|The coating has dark or black stripes||Organic impurities in the plating solution||Plating solution treatment|
|Zinc impurities in the plating solution||Removing Zinc Impurities by Electrolysis|
5. Major treatment methods for plating solution
5.1 Acidification: Adjust the plating solution with sulfuric acid to pH=3 and heat it up to around 50 ℃.
5.2 Oxidation: Add 2-3 ml/l of 30% hydrogen peroxide under continuous stirring for 2-3 hours.
5.3 Alkalization: adjust PH=5.5~6.2 with dilute sodium hydroxide solution.
5.4 Activated carbon treatment: Slowly add 3-5 g/l of powdered activated carbon under continuous stirring, heat to 60-80 ℃, continue stirring for a period of time, and then let it stand for filtration.
6. Removal of Unqualified Nickel Layer
6.1 Chemical Removal of Nickel Coatings on Copper and Copper Alloys
Anti pollution salt (sodium m-nitrobenzenesulfonate) industrial grade 70 ± 10 g/l
Sulfuric acid (H2SO4 specific gravity=1.84) industrial grade 70 ± 10 g/l
Sodium thiocyanate (NaSCN) 0.5 ± 0.3 g/l
Temperature 90 ± 10 ℃
Time surface changes from black to brown
Brown film is removed in the following solution
Sodium cyanide (NaCN) industrial grade 35 ± 5 g/l
Sodium hydroxide (NaOH) industrial grade 35 ± 5 g/l
Temperature room temperature
Time until net removal
Contact Person: Mrs. YeGuiFeng
Tel: +86 85778256