以环烷酸、十二硫醇及白油组成的合成油模拟含酸含硫原油，采用旋转高压釜动态失重实验和微观分析手段，研究280℃下不同硫含量和环烷酸对Cr5Mo低合金钢腐蚀行为的交互影响。研究表明，当油中硫醇（以硫计算）含量<2 mass%时，硫化物含量上升会迅速增加环烷酸的腐蚀性；而当油中硫含量>3 mass%后，由于保护性 Fe7S8/Cr5S8膜的形成，其腐蚀加速性又显著降低；高酸值下（原油酸值(KOH)>15 mg/g），硫醇反而会抑制环烷酸腐蚀，酸值越高，硫醇对环烷酸腐蚀的抑制作用越强。研究还发现，二甲基亚砜含氧硫化物比硫醇对环烷酸腐蚀具有更强烈的抑制作用。
Naphthenic acid corrosion (NAC), sulfur corrosion (SC) and their interaction on Cr5Mo carbon steel were studied by mass loss test using a spinning coupon inside a heated autoclave at 280℃. The test mixture with different level of sulfur content and total acid number were prepared by pure naphthenic acid, lauryl mercaptan and low sulfur white oil. It was found that the increasing sulfur content can accelerate the NAC dramatically when the sulfur content lower than 2.0 mass%. However, the boost effect of mercaptan to NAC decreased quickly when the sulfur content is higher than 3.0 mass{\%}, which could be attributed to the formation of protective Fe7S8/Cr5S8 layer confirmed by scanning electron microscope（SEM）, energy dispersive X-ray（EDX） analysis and X-ray diffraction（XRD） analysis. Surprisingly, high content of lauryl mercaptan could even inhibit the NAC in case of higher TAN (>15.0 mg/g KOH), and the increasing content of TAN could enhance the inhibition of mercaptan on NAC. In contrast, the dimethyl sulfoxide（DMSO）exhibits stronger inhibition ability than mercaptan in case of high TAN in the test mixture.
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