Room temperature corrosion behaviour of plastically deformed AISI 304 stainless steel by friction stir welding in neutral and acidified chloride solutions

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Engineering, Science and Technology Pub Date : 2022-07-30 DOI:10.1080/1478422X.2022.2105682

Anirban Naskar, Madhumanti Bhattacharyya, K. Raja, I. Charit, J. Darsell, S. Jana

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Abstract

ABSTRACT Severe plastic deformation of 304L stainless steel plate was carried out by friction stirring under an isothermal tool temperature at 825°C. The friction stirred zone showed extensive grain refinement, high fraction of low angle grain boundaries due to dislocation rearrangement, Σ3 and Σ9 special grain boundaries and discrete Fe–Cr–Mn-rich particles. Electrochemical polarisation measurements were done on the base metal (BM) and friction stir welded (FSW) specimens in the neutral and acidified 3.5% NaCl solutions. The BM showed marginally better pitting resistance in the neutral chloride solution than the FSW because of a larger fraction of special grain boundaries, and larger grain size. Whereas in acidified 3.5% NaCl solution, the FSW showed better corrosion resistance than the BM. The surface film of the FSW had a lower impedance and a lower defect concentration than the BM indicating higher diffusivity of point defects in the FSW.

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AISI 304塑性变形不锈钢在中性和酸化氯化物溶液中搅拌摩擦焊的室温腐蚀行为

摘要在825°C的等温工具温度下，通过摩擦搅拌对304L不锈钢板进行了剧烈塑性变形。摩擦搅拌区表现出广泛的晶粒细化、位错重排导致的高比例低角度晶界、∑3和∑9特殊晶界以及离散的富Fe–Cr–Mn颗粒。在中性和酸化的3.5%NaCl溶液中对基底金属（BM）和搅拌摩擦焊（FSW）试样进行电化学极化测量。BM在中性氯化物溶液中表现出比FSW略好的耐点蚀性，因为有更大比例的特殊晶界和更大的晶粒尺寸。而在酸化的3.5%NaCl溶液中，FSW表现出比BM更好的耐腐蚀性。FSW的表面膜具有比BM更低的阻抗和更低的缺陷浓度，这表明FSW中点缺陷的扩散率更高。

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.