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Hydrostatic pressure effects on corrosion behavior of X70 pipeline steel in a simulated deep-sea environment

机译:模拟深海环境中X70管线钢腐蚀行为的静液压作用

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摘要

Hydrostatic pressure (HP) effects on corrosion process of X70 steel in 3.5% NaCl solution have been investigated by situ electrochemical impedance spectroscopy (EIS), immersion tests and Raman spectra. These results indicate HP affects the corrosion behavior of the X70 steel during the whole immersion period. At the initial immersion, HP promotes the electrochemical reaction of corrosion process. Pitting initiation rate and propagation are both promoted by HP, corrosion rate increases with HP at the initial immersion period. At the stable immersion period, inner layer corrosion product is complete at 0.1 MPa, obvious cracks can be observed at 10 MPa. HP promotes Cl- transport and adsorption on the rust layer, corrosion rate slightly increases with HP.
机译:通过原位电化学阻抗光谱(EIS),浸渍试验和拉曼光谱研究了3.5%NaCl溶液中X70钢腐蚀过程的静水压压力(HP)对X70钢的腐蚀过程的影响。 这些结果表明HP在整个浸没期间影响X70钢的腐蚀行为。 在初始浸渍处,HP促进腐蚀过程的电化学反应。 点击发起率和传播均通过HP促进,腐蚀速率随初始浸没期的HP增加。 在稳定的浸渍时间内,内层腐蚀产物完成在0.1MPa下,可以在10MPa观察到明显的裂缝。 惠普促进了对铁锈层上的Cl-运输和吸附,腐蚀速率与HP略有增加。

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