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http://dx.doi.org/10.14773/cst.2021.20.5.281

Electrochemical Corrosion Damage Characteristics of Austenite Stainless Steel and Nickel Alloy with Various Seawater Concentrations  

Heo, Ho-Seong (Graduate school, Mokpo national maritime university)
Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
Publication Information
Corrosion Science and Technology / v.20, no.5, 2021 , pp. 281-288 More about this Journal
Abstract
Due to advancement of the industry, operation of a device in a harsh environment is increasing. Especially, the marine environment contains Cl- ions which causes localized corrosion such as pitting and crevice corrosion of stainless steel and various metals. In this study, electrochemical corrosion behaviors of austenitic stainless steel (STS 316L) and nickel alloy (Inconel 600) with different seawater concentrations (fresh water, seawater, mixed water) were investigated. The STS 316L and Inconel 600 were etched in 10% oxalic acid and composed of an austenitic phase. Results of Tafel analysis in seawater showed that STS 316L and Inconel 600 presented the highest corrosion current densities of 7.75 × 10-4 mA/cm2 and 1.11 × 10-4 mA/cm2 and the most negative pitting potentials of 0.94 V and 1.06 V, respectively. The maximum damage depths and surface damage ratio by pitting corrosion increased with chloride concentration. The STS 316L had higher PREN than Inconel 600. However, the surface damage and weight loss of Inconel 600 were superior to STS 316L. It was difficult to compare the pitting resistance of STS 316L based on Fe and Inconel 600 based on Ni with PREN simply.
Keywords
STS 316L; Inconel 600; Seawater concentration; Electrochemical corrosion; PREN;
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