Research on the initial corrosion behavior of D36 steel and its welds in different simulation marine environments

doi:10.11902/1005.4537.2025.157

Journal of Chinese Society for Corrosion and protection DOI: 10.11902/1005.4537.2025.157

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. Research on the initial corrosion behavior of D36 steel and its welds in different simulation marine environments. Journal of Chinese Society for Corrosion and protection, 0, (): 0-0.

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Abstract The severe corrosion environment in the ocean has seriously impeded the development of offshore oil and gas equipment. In this paper, the initial corrosion behavior of D36 steel and its welds for offshore platforms under various simulated marine environment was investigated by weight loss measurements and microscopic characterization techniques. The results showed that across different marine environments, the initial corrosion rate trends for both the base metal and welds of D36 steel were consistent, following the order, tidal zone > splash zone > marine atmosphere > full immersion zone. Under identical conditions, the corrosion rate of the welds exceeded that of the base metal. In the marine atmosphere and splash zones, the base metal exhibited a morphology characterized by general corrosion accompanied by pitting corrosion, whereas it demonstrated uniform corrosion in the tidal and full immersion zones. The welds displayed general corrosion with accompanying pitting corrosion in all four environments. In the marine atmosphere, corrosion products predominantly consisted of non-protective γ-FeOOH. In the splash zone, wave impacting led to rust layer detachment, maintaining oxygen saturation and resulting in a relatively high corrosion rate. In the tidal zone, wet-dry cycles induced micro-cracks in corrosion products, diminishing their protective properties. In the immersion zone, reduced oxygen content suppressed the cathodic reaction, leading to the lowest corrosion rate. In D36 steel, ferrite and pearlite formed a micro-galvanic cell in the marine environment, where ferrite acted as the anode and underwent dissolution. The increased proportion of pearlite in the welds enhanced local corrosion intensity, thereby increasing the corrosion rate of the welds compared to the base metal.

Key words: D36 steel Weld seam Marine environment Initial corrosion behavior

Received: 26 May 2025

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	TIAN Yi-Chen
	CHEN Xu
	ZHANG Guo-Qiang
	SONG Bo
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	HUANG Chao
	XIAO Cheng-Can

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.157 OR https://www.jcscp.org/EN/Y0/V/I/0

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