Abstract
This study aimed to investigate the effects of difference in nickel content and the tempering temperatures on the corrosion resistance in 13Cr2Ni0.1C and 13Cr1Ni0.15C steels. Results showed that passive film in 13Cr2Ni0.1C steel is formed more quickly at the lowest and highest tempering temperature (650°C and 750°C) but the lowest tempering temperature (650°C) showed better resistance to corrosion pitting. There was passive film formation and pitting corrosion in all tempering temperatures of the 13Cr1Ni0.15C steel and changes in tempering temperature does not significantly alter polarization curves, showing similar behavior to steel 13Cr2Ni0.1C tempered at 650°C.
Highlights
The study of corrosion marine environments is interesting for low carbon martensitic stainless steels because of the wide use of these steels in equipment applied in the petrochemical industry and oil production in offshore platforms[1,2,3]
Localized pitting corrosion is the most common type of corrosion and difficult to control in marine environment, especially in deep waters, which are characterized by high concentration of chlorides, low O2 concentration, presence of corrosive gases - such as CO2 and H2S - microorganisms and other dissolved salts[4]
The microstructural changes caused by certain heat treatments applied to stainless steels can result in the formation of surface films that exhibit different protection capabilities to resist to pitting corrosion
Summary
The study of corrosion marine environments is interesting for low carbon martensitic stainless steels because of the wide use of these steels in equipment applied in the petrochemical industry and oil production in offshore platforms[1,2,3]. Localized pitting corrosion is the most common type of corrosion and difficult to control in marine environment, especially in deep waters, which are characterized by high concentration of chlorides, low O2 concentration, presence of corrosive gases - such as CO2 and H2S - microorganisms and other dissolved salts[4]. The superior corrosion properties of stainless steels result from the formation of a thin oxide film on surface, called as the passive film[5]. Pitting corrosion occurs when the passive film breaks down in the presence of aggressive ions, such as chloride ions, resulting in the local dissolution and cavities on the metal surface[6,7]. The microstructural changes caused by certain heat treatments applied to stainless steels can result in the formation of surface films that exhibit different protection capabilities to resist to pitting corrosion
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