To prevent rust, steel surface treatment is essential. Therefore, before you apply acid wash once, use a professional degreasing formula to remove the steel surface oil. Sometimes, even with extensive treatments, it's not possible to completely prevent rust on the surface of steel or stainless steel. After degreasing, the stainless steel surface becomes smooth, preventing the steel from rusting when exposed to air oxidation. Phosphating treatment needs to be done immediately after this step. Once the steel surface is phosphated and a thin phosphating film is attached, it can be well exposed to air, preventing oxidation of the steel. The entire process is comprehensive. Before plastic powder coating, it is crucial to ensure the surface is dry and dust-free, allowing the plastic powder to adhere tightly to the steel surface. Even a hammer won't easily dislodge it.