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首页> 外文期刊>Corrosion Engineering, Science and Technology >Passivation/immersion method to grow pits in pipeline steel and a study of pit nucleation and growth resulting from the method
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Passivation/immersion method to grow pits in pipeline steel and a study of pit nucleation and growth resulting from the method

机译：钝化/浸没法在管线钢中产生点蚀，并研究该方法导致的点蚀成核和长大

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摘要

A newly developed passivation/acid immersion technique was employed to produce pits free from deformation or residual stress on X-52 pipeline steel samples. Pits have been found to be a common source of crack initiation and the experimental procedure would prove useful in research in crack initiation. Pits generated using this technique were approximately hemispherical. It was seen that individual pits increased in radius at a linear rate of 0·33 μm h−1 and depth at a linear rate of 0·39 μm h−1. In the early stage of the process, single pit nucleation was the dominant process, and the area covered by pits increased to 1·7% in the first 40 h, and 75% of the pits were individual pits. In contrast, pit coalescence became significant in the later stages, and by 120 h the area coverage was up to 13·5% and only 50% of the pits were individual pits. The linked pits contained an increasing number of individual pits as time progressed containing up to five pits after 120 h and the linked pits tended to become more circular with time. The growth behaviour of linked pits was significantly different from individual pits. This study establishes some of the details of how pits nucleate, grow and link together. The published literature showed that the growth exponent of pits varied with the severity of the corrosion environment and the growth law determined here was at the high end of the published growth exponents.
机译：采用新开发的钝化/酸浸技术在X-52管线钢样品上产生无变形或残余应力的凹坑。已经发现坑是裂纹萌生的常见来源，并且实验程序将证明对裂纹萌生的研究有用。使用此技术生成的坑大约为半球形。可以看出，单个凹坑的半径以0·33μmh -1 的线性速率增加，深度以0·39μmh -1 的线性速率增加。在该过程的早期，主要是单个凹坑成核，凹坑所覆盖的面积在开始的40小时内增加到1·7％，而单个凹坑的占75％。相反，凹坑合并在后期阶段变得很明显，到120 h时，区域覆盖率高达13·5％，只有50％的凹坑是单个凹坑。随着时间的推移，连接的凹坑包含的单个凹坑数量不断增加，在120小时后最多包含五个凹坑，并且随着时间的推移，连接的凹坑趋于变得更圆。相连凹坑的生长行为与单个凹坑明显不同。这项研究确定了凹坑如何形核，生长和连接在一起的一些细节。已发表的文献表明，点蚀的生长指数随腐蚀环境的严重程度而变化，此处确定的生长规律处于已发表的生长指数的高端。

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