Composite sulfonic acid and barium hydroxide synthesis, barium, filter product. Performance and application: Good oil solubility, ferrous metals and non-ferrous metals: steel, copper, and aluminum have good rust resistance, applied in rust resistance oil, can form rust resistance oil film adsorbed on the metal surface, prevent metal corrosion, non-ferrous metals have good rust resistance performance is widely used in various types of rust resistance oil and cutting oil.