Product surface shows salt bloom
The main cause of salt flowers appearing is due to the unremoved molten salt adhering to the surface of galvanized steel after the aluminum coating process, leading to salt flowers resembling snowflakes on the guardrail panels after coating. The solution is to properly and reasonably use a solution of nitric acid at the appropriate concentration to clean the guardrail panels for a suitable duration. Simultaneously, the panels should be moved within the treatment tank to achieve an excellent processing effect.
(2) Product board surface exhibits nodules, scar grass, and rough texture
The primary causes of nodules and scars are twofold: first, inadequate pretreatment before aluminum coating, leading to rust, oxide layers, and other contaminants on the sheet surface, resulting in uneven thickness; second, unstable temperature in the aluminum coating tank, with excessive aluminum slag at the bottom, causing inconsistent thickness of the aluminum layer on the sheet surface and leading to scars and other defects. The solution is to enhance the pretreatment process before aluminum coating and to promptly clean the coating tank during the coating process, ensuring consistent and stable tank temperature. This will help reduce the occurrence of these issues.
(3) Defects such as missing electroplating appear on the finished board surface
The cause of insufficient electroplating is insufficiently thorough pre-treatment before aluminum plating, specifically inadequate degreasing and acid washing processes. Residual oil, rust, and oxides on the steel surface lead to insufficiently tight bonding between the aluminum plating layer and the sheet during the aluminum plating process, resulting in phenomena such as peeling off of the coating or the coating not adhering properly. The solution is to strictly monitor and carefully handle each step in the pre-treatment process, ensuring thorough processing at each stage to guarantee the quality of the finished guardrail panels.
