Abstract: In the operation of aviation gas turbine engines using some hydrocarbon fuels, pitting corrosion on heat resistant Ni-Cr alloy parts in the combustion chamber has been observed.Experiments indicate that the pitting corrosion is not caused by impurities in the fuel but by the hydrocarbons. Investigation of the effect of various gas components on the heat resistant Ni-Cr alloys and nickel, of the carbon deposits formed on the alloy surface and of the changes in alloy composition of the attacked parts reveals that the bulk alloy is attacked by the burning hydrocarbons containing methane and carbon monoxide through carburization of the alloy which give rise to the precipitation of chromium carbides and the formation of nickelrich spots. As a consequence of the catalytic action of nickel on hydrocarbons, dehydrocondensation reactions take place and the corroded surface is readily covered with carbon by graphitizing action. It is theorized that pitting corrosion of the Ni-Cr alloys occur through these processes. It can be inhibited by the addition of some sulfur, arsenic or selenium compounds into the fuels to hinder the undesired catalytic dehydrocondensation reactions.

摘要： 烃类燃料燃烧过程中引起合金腐蚀的原因,一般都认为是硫或重金属如钒等所造成的。五十年代后期我们在试验喷气燃料的燃烧性能时,发现有些喷气燃料引起镍铬合金的燃烧室一次燃烧区严重坑点腐蚀(图1、2)。通过深入探讨,证明腐蚀不是硫或重金属等杂质所引起的,而是烃类本身造成的。某些喷气燃料不引起镍铬合金燃烧坑点腐蚀,是因为燃料中的杂质有抑制腐蚀作用。由此找到了加入添加物以抑制腐蚀的途径。