Effect of Chloride Concentration on Stress Corrosion Behavior and Mechanism of SA516Gr70N Steel in Alkaline NaCl/Na2S Solution

Synergistic Effect of the Total Acid Number, S, Cl, and H2O on the Corrosion of AISI 1020 in Acidic Environments

“…However, some scholars have recently discovered that HS – is more corrosive than Cl – in and alkaline environment. 29 …”

“… 15 , 30 Obviously, chlorine will not only corrode the equipment but also influence the effect of the corrosion product protection film and destroy the integrity of the anticorrosive protection film. 29 In the process of removing organic chlorine from oil products, a more selective dechlorination method should be used.…”

“…Due to the destruction of the FeS film by chemically unstable organic chlorides, the two different types of corrosion product films of FeS and ferrochloride alternately evolve, gradually deepening the erosion depth, which also makes chlorine the dominant cause of corrosion. However, some scholars have recently discovered that HS – is more corrosive than Cl – in and alkaline environment …”

“…The corrosion rates at the three levels corresponding to the TAN, S, Cl, and H 2 O all gradually decreased over time. After the protective corrosion products are formed on the metal surface, Cl can effectively penetrate with oxygen or sulfur and form a metal salt, which causes the surface film to crack and accelerates the progress of corrosion. , Obviously, chlorine will not only corrode the equipment but also influence the effect of the corrosion product protection film and destroy the integrity of the anticorrosive protection film . In the process of removing organic chlorine from oil products, a more selective dechlorination method should be used.…”

“…However, some scholars have recently discovered that HS − is more corrosive than Cl − in and alkaline environment. 29 Compared with sulfides and chlorides, the effect of NAC in oil products is more complicated. Generally, carbon steel and organic acids form oil-soluble corrosion products (eq 7), but due to the presence of active sulfur, the formed FeS protective film hinders the corrosion of steels by naphthenic acid to some extent (eq 8).…”