Corrosion behavior of.low alloy steel for.cargo oil tank under.upper deck conditions

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Abstract A simulated corrosion test apparatus was used to investigate the corrosion behavior of a low alloy steel under simulated upper deck conditions in a cargo oil tank. The estimated corrosion loss of conventional E36 class ship plate steel is 4.27.mm, which is clearly inadequate compared with the standard adopted by International Maritime Organization. Outer rust layer of specimens starts to peel o. after 77.days and becomes fragmented after 98.days. X-ray di.raction, scanning electron micros-copy, and Raman spectroscopy revealed that the resulting rust is composed of ��-FeOOH (the main protective phase), Fe2O3, FeS, elemental S, and FeSO4. FeSO4 in the interface of the base and rust layer leads to localized corrosion. Elemental sulfur forms on the surface of ��-FeOOH, and the quantity and size thereof increase with increasing corrosion time. Furthermore, layered elemental sulfur promotes fracture and peels o. the rust layer.

Key words�� low alloy steel cargo oil tank upper deck corrosion film elemental suifur

Received: 20 December 2016 Published: 15 May 2018

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	LI Hao
	CI Feng
	YANG Cai-Fu
	LI Tiao
	LUO Xiao-Bing

Cite this article:

LI Hao,CI Feng,YANG Cai-Fu��. Corrosion behavior of.low alloy steel for.cargo oil tank under.upper deck conditions[J]. Journal of Iron and Steel Research International, 2018, 25(1): 120-128.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2018/V25/I1/120

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