铝对4Cr1.5Ni耐候钢组织和耐候性的影响

doi:10.13228/j.boyuan.issn0449-749x.20220475

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Abstract Weathering steel has good atmospheric corrosion resistance, but traditional weathering steel cannot be used in high-humidity and hot marine atmospheric environment, relevant reports pointed out that it has accelerated corrosion after 8 years of exposure to the sun in Wanning. To meet the needs of marine engineering development, it is particularly important to optimize traditional weathering steel or develop new weathering steel. Two new weathering steels, 4Cr1.5Ni and 4Cr1.5Ni0.8Al, were designed based on traditional low-carbon steel composition and considering laterite nickel ore resources. The indoor accelerated dry-wet cyclic corrosion test was used to simulate the high humidity and heat Marine atmosphere environment. The microstructure and weatherability of the new weather-resistant steel were studied by combining OM, SEM, EDS, XRD, XPS and electrochemical methods. The effects of aluminum addition on microstructure, morphology of initial corrosion rust layer, phase composition and protection ability of test steel were analyzed emphatically. The relevant results can provide a reference for the development of new weathering steel suitable for the high-humidity and heat marine atmospheric environment. The results show that the microstructure of 4Cr1.5Ni steel is ferrite and martensite, and that of 4Cr1.5Ni0.8Al steel is ferrite and a little pearlite. The addition of aluminum can promote the formation of ferrite. The addition of aluminum reduces the corrosion rate, rust layer thickness and corrosion current density of 4Cr1.5Ni steel, and increases the corrosion potential and rust layer resistance. The α/γ(α-FeOOH/γ-FeOOH) value of 4Cr1.5Ni0.8Al steel is 2.5 times that of 4Cr1.5Ni steel, and the protection ability of the rust layer is enhanced. The presence of aluminum in the rust layer in the form of +3 valence (AlOOH and Al (OH)₃), and at the same time promotes the formation of FeCr₂O₄ which is thermodynamically more stable in the initial rust layer. In particular, the distribution area of aluminum and chromium in the rust layer of 4Cr1.5Ni0.8Al steel is the same, that is, there is a synchronous enrichment phenomenon, indicating that there is a synergistic effect of aluminum and chromium.

Key words： weathering steel Cr-Al synergy initial rust layer marine atmospheric environment ferrite synchronous enrichment

Received: 12 July 2022

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	Articles by authors
	WANG Jin-jian
	CHEN Run-nong
	HU Hui-chao
	LIU Jing
	CAO Yan-guang
	LI Zhao-dong

Cite this article:

WANG Jin-jian,CHEN Run-nong,HU Hui-chao等. Effect of Al on microstructure and weathering resistance of 4Cr1.5Ni weathering steel[J]. Iron and Steel, 2023, 58(2): 126-136.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220475 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I2/126

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