用热喷涂技术防止湿硫化氢应力腐蚀

STUDY ON THERMAL SPRAYING TECHNIQUE USED FOR RESISTANCE TO WET H_2S SULPHIDE STRESS CRACKING

采用热喷涂技术 ,设计了Al系、Fe-Cr系粉芯丝材涂层共 5种 ,并对其进行了结合强度、氢扩散能力、电化学性能及应力腐蚀性能等系列试验 ,考核其抗湿硫化氢应力腐蚀能力 .通过对各涂层试验结果的对比分析 ,从中筛选出了防护效果最佳的配方 ,并对涂层抗湿硫化氢应力腐蚀的机理进行了讨论 .

Considering the urgent need for methods of resistance to wet H 2S stress corrosion cracking (SSC) during petrochemical production,this paper,with a view to isolate substrate from the corrosives,introduced arc spraying metallic coatings as a method resistant to SSC.Five coating products including both coatings of Al series and coatings of Fe-Cr series,which are made from self-developed cored wires,were designed.A series of tests where variables such as bond adhesion tests,hydrogen permeation tests,electrochemical tests and stress corrosion tests were carried out in order to check the performance of SSC.The test results of all kinds of coatings were compared with each other,a kind of most protective coating termed ZH4 containing Al+Al 2O 3+RE was obtained.In addition,the protective mechanism of coatings resistance to SSC was discussed.