西太平洋深海环境中Ni-Cr-Mo-V高强钢的腐蚀行为

Corrosion Behavior of Ni-Cr-Mo-V High Strength Steel in Deep Sea Environment of Western Pacific Ocean

采用深海高效串型试验装置对Ni-Cr-Mo-V高强钢在西太平洋深海环境中进行了深海腐蚀试验,并利用扫描电镜、能谱仪、拉曼光谱仪和扫描开尔文探针等方法,研究了该钢在500,800,1200,2000 m海深下的腐蚀行为。结果表明:Ni-Cr-Mo-V高强钢在500,800,1200,2000 m深海环境中暴露1 a后的腐蚀速率分别为0.130,0.096,0.093,0.081 mm/a,腐蚀速率随深度的增加逐渐减小;在深海环境中,该钢表面形成浅碟状点蚀坑,部分区域点蚀坑合并形成均匀腐蚀形貌;该钢在深海环境中的腐蚀产物主要包括α-Fe_(2)O_(3)、γ-FeOOH与α-FeOOH。

The deep-sea corrosion test of Ni-Cr-Mo-V high strength steel in the deep-sea environment of the Western Pacific Ocean was carried out by a deep-sea high-efficiency tandem test device.The corrosion behavior of the steel at 500,800,1200 and 2000 m sea depths was studied by means of scanning electron microscopy,energy dispersive spectroscopy,Raman spectroscopy and scanning Kelvin probe.The results show that the corrosion rates of Ni-Cr-Mo-V high-strength steel exposed to 500,800,1200 and 2000 m deep-sea environment for 1 a were 0.130,0.096,0.093 and 0.081 mm/a,respectively.The corrosion rate decreased with the increase of depth.In the deep sea environment,shallow dish-like pitting pits were formed on the surface of the steel,and pits in some areas merged to form uniform corrosion morphology.The corrosion products of the steel in deep sea environment mainly includedα-Fe_(2)O_(3),γ-FeOOH andα-FeOOH.