Pitting corrosion of austenitic and duplex stainless steels in dilute acids at elevated temperature: Effect of electrolyte chemistry and material microstructure

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-02-12 DOI:10.1016/j.corsci.2025.112769

Andressa Trentin , Ahmad Mardoukhi , Aloshious Lambai , Pekka Pohjanne , Elina Huttunen-Saarivirta

引用次数: 0

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.

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奥氏体和双相不锈钢在高温稀酸中的点腐蚀：电解液化学性质和材料微观结构的影响

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

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.