Pitting corrosion of austenitic and duplex stainless steels in dilute acids at elevated temperature: Effect of electrolyte chemistry and material microstructure
Andressa Trentin , Ahmad Mardoukhi , Aloshious Lambai , Pekka Pohjanne , Elina Huttunen-Saarivirta
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Abstract
The pitting behavior of seven stainless steel grades with austenitic and duplex microstructures in varying acids (HCl, H2SO4, HCOOH), chloride concentrations (500–5000 mg/L), and pHs (2.5, 4.0) was investigated at 90°C. Low- and intermediate-PREN grades were prone to pitting under the test conditions. The electrolyte ranking by pitting susceptibility was HCl > H2SO4 > HCOOH, while the progress of pitting attack in materials followed the reverse order: HCOOH > H2SO4 > HCl. The presence of a lacy cover prevents repassivation favoring a concentric "Russian doll" structure and high loss rates. The mechanisms of pitting propagation are presented in this paper.
期刊介绍：
Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies.
This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.
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