The mechanism of weather resistance of China 05CuPCrNi hot rolled structural steel plate is different from that of general corrosion-resistant alloy. Cu element has the electrochemical depolarization effect, which promotes the formation of a dense and firm protective film on the surface of steel base over a certain period of time, slowing down the erosion of atmospheric factors. Cu and P are added to 05CuPCrNi structural steel plates to improve corrosion resistance and strengthen ferrite in solid solution.
P is the most effective element in the alloy element to improve the atmospheric corrosion resistance. It is the anode depolarization agent. In the electrolyte solution, it can accelerate the uniform dissolution of steel and the oxidation rate of iron, and help to form a uniform corrosion layer on the steel surface, which is clearly separated from the inner rust layer, so as to improve the corrosion performance of steel. Cr is also one of the alloy elements to improve the atmospheric corrosion resistance of low alloy steel. Cr has low corrosion potential and is an element with passivation tendency, which promotes the formation of a dense oxidized passivation film on the surface of steel in the atmosphere, thus improving the corrosion resistance of steel.
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