Effect of grain boundary engineering on electrochemical and intergranular corrosion of 316L stainless steel

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

Corrosion Science Pub Date : 2025-05-22 DOI:10.1016/j.corsci.2025.113050

Chen Wang , Jun Yin , Jiayi He , Xiaobo Zhu , Zikai Wu , Kuangxin Luo , Fenghua Luo

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Abstract

The grain boundary engineering of 316 L SS was carried out by cold rolling and annealing. The microstructure was analyzed by EBSD, and the corrosion behavior was studied by electrochemical test, immersion and acid electrolytic corrosions. The results showed that the proportion of the low-Σ coincidence site lattice (CSL) boundaries in the sample via 60 % cold rolling deformation and annealing at 1050 °C for 50 min increases to 58.04 %, with the Σ3 accounting for 91.49 % of the total low-Ʃ CSL boundary. In terms of corrosion properties, this sample has larger total polarization resistance (97,247 Ω/cm²). The improved corrosion resistance is attributed to its higher proportion of Σ3 grain boundaries (especially coherent Σ3 boundaries), and larger proportion of (J2 +J3) in the triple junction distribution. The combined effect obtained from the increase of low-energy Σ3 boundaries and the interruption of the random high-angle grain boundary network is more effective in suppressing intergranular attacks. The corrosion morphology showed that the specimens with the degree of sensitization values more than 0.5 % exhibit significant intergranular corrosion, and their corrosion morphology transitioned from boundary-controlled (ditch) to surface-controlled (step) corrosion.

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晶界工程对316L不锈钢电化学和晶间腐蚀的影响

通过冷轧和退火对316 L SS进行了晶界工程。采用EBSD对其微观组织进行了分析，并通过电化学测试、浸没腐蚀和酸电解腐蚀研究了其腐蚀行为。结果表明：经60 %冷轧变形和1050℃50 min退火后，样品中低-Σ重合点晶格（CSL）晶界的比例增加到58.04 %，其中Σ3晶界占总低-Ʃ重合点晶格晶界的91.49 %；在腐蚀性能方面，该样品具有较大的总极化电阻（97,247 Ω/cm2）。提高耐蚀性的主要原因是其Σ3晶界（特别是共格Σ3晶界）的比例较高，以及（J2 +J3）在三结分布中的比例较大。低能Σ3晶界的增加和随机高角度晶界网络的中断所获得的联合效应对抑制晶间攻击更为有效。腐蚀形貌表明，敏化度大于0.5 %的试样表现出明显的晶间腐蚀，腐蚀形貌由边界控制型（沟槽型）向表面控制型（阶梯型）转变。

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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.