Hydrogen Embrittlement of High Strength Steels Coated by Aluminum Alloy

镀锌层及其牺牲保护作用提高了高强度钢在大气腐蚀条件下的氢脆敏感性。另一方面，对于铝合金涂层钢，它却得到了实质性的抑制。对镀铝钢的牺牲电势进行了解释。0。7V，与镀锌层相比，该电位下的析氢反应受到抑制。1.0V。钢的吸氢量取决于钢的组织结构。当氢在钢中的扩散常数很小时，如马氏体钢，随着湿/干腐蚀循环次数的增加而增加。

Susceptibility of hydrogen embrittlement of high strength steel in atmospheric corrosion condition is enhanced by zinc coating and its sacrificial protection action. On the other hand, it for aluminum alloy coated steel is substantially suppressed. It was explained that the sacrificial potential for aluminum coated steel ranged around. 0. 7V and hydrogen evolution reaction was inhibited in this potential compared with that for zinc coated was. 1. 0V. Amount of hydrogen absorbed into steel depended upon the microstructure of the steel. It increased with number of wet/dry corrosion cycles when the diffusion constant of hydrogen in the steel was very small, such as martensitic steel.