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The role of hydrogen in carbonate stress corrosion cracking of low-carbon steel.

机译：氢在低碳钢的碳酸盐应力腐蚀开裂中的作用。

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Hydrogen generation and ingress into low carbon steel has been discovered at high anodic potentials of high-pH stress corrosion cracking in the so-called “standard” carbonate-bicarbonate solution.; The experimental study showed that hydrogen absorption occurs over the whole range of anodic potentials which cause transgranular stress corrosion cracking and coincides with formation of iron (II) carbonate. Also, hydrogen ingress into steel was measured at the lowest part of the range of potentials where most severe intergranular stress corrosion cracking takes place and where the passive film is a composite of siderite and magnetite.; Hydrogen absorption occurs at least 170 mV above the so-called line (a) on the Pourbaix diagram and thus it is not governed by known cathodic reactions but by another process. An adsorption based model for anodic hydrogenation in bicarbonate solution has been proposed. Other experimental findings and theoretical calculations in relation to high pH stress corrosion cracking of low carbon steel are presented.
机译：在所谓的“标准”碳酸盐-碳酸氢盐溶液中，在高pH应力腐蚀开裂的高阳极电位下，发现了氢气的产生和进入低碳钢中。实验研究表明，在整个阳极电位范围内都会发生氢吸收，这会引起跨晶应力腐蚀裂纹，并与碳酸铁（II）的形成相吻合。另外，在最严重的晶间应力腐蚀开裂发生的地方和钝化膜是菱铁矿和磁铁矿的复合物的电位范围的最低部分，测量了氢进入钢中的程度。氢吸收发生在Pourbaix图上所谓的（a）线以上至少170 mV处，因此它不受已知的阴极反应控制，而由另一过程控制。提出了基于吸附的碳酸氢盐溶液阳极加氢模型。提出了与低碳钢的高pH应力腐蚀开裂有关的其他实验结果和理论计算。

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