Study On Corrosion-Wear Characteristics Of Low Chromium White Cast Iron

The low chromium white cast iron has been widely used in the field production as a result of better wear resistance and lower price. With the environmental protection request enhancement, the non-ferrous metal mine uses the water used to carry on the production, in which mainly includes Cu²⁺, Fe²⁺/Fe³⁺, SO₄^2- and so on. In the field production, these ions existences increase the wear of low chromium white cast iron grinding balls.The corrosion wear behaviors of low chromium white cast iron were studied by using three-body corrosion wear tester in slurries contained with different ions concentration in this paper. The results showed that the corrosion wear resistance of low chromium cast iron would be decreased with the increase of Cu²⁺ concentration in slurries. Because Cu²⁺ ion will react with the iron in low chromium white cast iron by oxidation-deoxidation reaction, the quality-loss of low chromium white cast iron would be increased. The speed of chemistry corrosion of low chromium white cast iron would be accelerated with the increase of its wear; At the same time, iron in the surface of low chromium cast iron was changed into copper and deposited in the wear surface. This would lead to the quality of samples removes easily. When the slurries contained some Fe²⁺\Fe²⁺ ions, the Fe²⁺\Fe³⁺ ions acted the same action as Cu²⁺ ion in the slurries. The Fe²⁺\Fe³⁺ ions would react with iron in low chromium cast iron by oxidation-deoxidation reaction, and made the quality-loss of low chromium cast iron increase. The concentration of Fe²⁺\Fe³⁺ in slurries would be increased with the increase of wear of low chromium cast iron, and led the speed of chemistry corrosion increase. With the increase of SO₄^2- ion concentration in slurries, the corrosion-wear resistance of low chromium cast iron would be also decreased, but the decrease degree of corrosion-wear resistance would be smaller than in Cu²⁺, Fe²⁺\Fe³⁺ in slurries. This is because that neutral sulfate existed as electrolyte in the slurries, which could accelerate the electrochemistry corrosion of low chromium cast iron. Therefore the SO₄^2- ion would decrease...