Major Causes of Alkaline Galvanizing Blistering
Author: Robby
Poor treatment before plating: the surface of workpiece is not clean, oil removal is not thorough or acid corrosion is excessive, which leads to blistering of the plating layer.
Improper temperature of plating solution: too low or too high temperature of plating solution will lead to increased internal stress of the plating layer, thus causing blistering.
Excessive additives: excessive additives in the plating solution will lead to increased internal stress in the plating layer, causing blistering.
Excessive organic impurities: excessive organic impurities in the plating solution will lead to lattice distortion, increase the internal stress of the plating layer, causing foaming.
Metal impurities in the plating solution: heavy metal impurities in the plating solution, such as copper, lead, etc. will lead to poor combination of plating and substrate, causing blistering.
Improper choice of hooks: improper choice of hooks or broken will lead to electrolyte corrosion, causing blistering of the plated layer.
Improper passivation operation: improper passivation operation or incomplete cleaning will lead to increased internal stress in the plating layer, causing blistering.
Solutions to alkaline galvanizing blistering
Optimize pre-plating treatment: Ensure that the surface of the workpiece is clean and thoroughly degreased to avoid excessive acid corrosion.
Control the temperature of the plating solution: keep the temperature of the plating solution within the appropriate range, avoid too low or too high.
Adjust the amount of additives: additives in the right amount, avoid excessive.
Filter the plating solution: Filter the plating solution regularly to remove organic and inorganic impurities.
Choose the right hangers: Choose the right hangers, and regularly check whether the hangers are broken or not.
Standardize passivation operation: Standardize passivation operation to ensure thorough cleaning and avoid blistering caused by residues.