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    • 5. 发明申请
    • METAL ANTICORROSIVE COATING, PREPARATION METHOD THEREFOR, AND USE THEREFOR
    • US20210188699A1
    • 2021-06-24
    • US17054177
    • 2019-11-05
    • Zhejiang University
    • Dongming YanYi LiuZhihao Huang
    • C03C8/14C23D5/04
    • The invention discloses a metal anticorrosive coating. The coating is an inorganic coating used for metal anticorrosion. This coating has a double-layer structure, including an outer enamel coating and an inner base oxide coating. Meanwhile, the content of the base metal oxide decreases from the inner layer to the outer layer, which causes the thermal expansion coefficient of the coating to increase from the inner layer to the outer layer, ensures that the overall thermal expansion coefficient of the coating is coordinate with various base metals. The composition of the outer layer enamel coating includes: by weight, 1-40 parts of silicon, 1-30 parts of sodium, 1-20 parts of potassium, 2-20 parts of calcium, 0.5-15 parts of fluorine, 0.3-10 parts of cobalt, 0.2-10 parts of nickel, 1-18 parts of boron, 0.5-10 parts of phosphorus, 0.1-8 parts of magnesium, and the rest is oxygen; the composition of the base oxide coating of the inner layer includes the base metal and oxygen. A preparation process of a double-layer dense metal anticorrosive coating formed by low-temperature sintering is also disclosed, including the following steps: 1) grinding; 2) preparation of mixture; 3) grinding; 4) high temperature reaction; 5) grinding; 6) coating; 7) sintering. The coating of the invention has the advantages of improving the corrosion resistance by more than 14 times, has a high ductility which can be coordinated with the reinforcing steel bar in tensile deformation, has a thermal expansion coefficient gradient which can be applied to different metals and different types of the same metal.