添加Al对高Mn钢在含Cl−环境中腐蚀行为的影响

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Pub Date : 2023-03-27 DOI:10.5006/4284

Ning Liu, X. Yang, Jun Chen

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引用次数: 0

摘要

高锰钢因其成本低、强度高、低温冲击韧性好等优点，有望成为LNG(液化天然气)储罐建造的新型钢材。到目前为止，对高锰钢在含氯环境中的腐蚀行为的研究仍然有限。结果表明:外锈层存在强Mn富集层，内锈层存在强Al富集层。Al和Cl在同一区域同时富集。将Al含量从5.0质量%提高到8.0质量%，虽然可以进一步提高耐蚀性，但由于δ-铁素体的形成，提高程度变弱，点蚀变得严重。从两个方面来解释为什么Al提高了耐蚀性:1)添加更多的Al可以增强被动氧化物的耐蚀性。2)增加Al的含量可以提高α-FeOOH的含量，提高锈层的密实度。

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Effect of Al addition on corrosion behavior of high Mn steels in a Cl− containing environment

The high Mn steels are expected to become a novel steel for LNG (Liquefied Natural Gas) tank building because of their low cost, high strength and excellent low-temperature impact toughness. Up to now, it is still limited for studies on corrosion behavior of high Mn steel in a Cl- containing environment. We found that a strong Mn enrichment layers always exist in the outer rust layer, whereas a strong Al enrichment layers always exist in the inner rust layer. However, the Al and Cl simultaneously enrich in the same area. Although the corrosion resistance can be further improved by increasing Al content from 5.0 to 8.0 mass%, the improvement degree becomes weak and the pitting corrosion becomes serious due to the formation of δ-ferrite. There are two aspects to explain why Al improves corrosion resistance: 1) More Al addition can enhance the resistance of passive oxide. 2) The α-FeOOH content can be increased and the compactness of rust layer can be also enhanced by increasing Al content.

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.