Abstract
Experiments and theoretical calculations were conducted on the corrosion behavior and mechanism of SAE 1020 steel in NH4Cl solution. In-situ measurements demonstrate that temperature and concentration exert a great impact on corrosion and that the interfacial phenomena differ in early stages of immersion, while ex-situ measurements indicate the development of the corrosion product film from loose to denser. The Kelvin potential increases with temperature and concentration, exhibiting a significant characteristic of pitting corrosion. Additional kinetic trajectory simulation was conducted to combine surface reactions with hydrolysis of NH4+ to illustrate the essence of corrosion as a modification of the chemical bond.
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