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STUDY ON THERMAL SPRAYING TECHNIQUE USED FOR RESISTANCE TO WET H2S SULPHIDE STRESS CRACKING |
Yiliang Zhang;Mu Wang;Yaofeng Sun |
北京工业大学机电学院 |
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Abstract Considering the urgent need for methods of resistan ce to wet H2S 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 i ncluding 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+Al2O3+RE was obtained.I n addition,the protective mechanism of coatings resistance to SSC was discussed.
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Received: 20 November 2001
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Corresponding Authors:
Yiliang Zhang
E-mail: zhangyil@bjut.edu.cn
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