PRETREATMENT PROBLEM SOLVER

摘要

White powdery substance on steel after cleaning P.M.L., of Ho Chi Minh, Vietnam, sends his best wishes. He now has a powder coating system, but he has some troubleshooting he needs to do in the pretreatment stage before spraying the powder coatings. After he dips the steel into zinc phosphate and dries it, the surface of the steel has white powder on it and is not good.