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| THE CORROSION BEHAVIOUR OF UG316L/25-22-2 WELD SYSTEM IN 1 mol/L H_2SO_4 |
| Li Yi and Zhang Shihua (South China University of Technology) |
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Abstract Corrosion behaviour of 316L/25-22-2 austenitic stainless steel weld system in deaerated 1 mol/L H_2SO_4 (30℃) solution was comprehensively studied by metallographical examination, electron probe microanalysis, and electrochemical method, including the measurement of corrosion at controlled-potential and potential distribution determination. Results of electrochemical research show that only slight general corrosion occurs for this weld system in the active potential region and in the active-passive transition potential region, as well as in the passive-transpassive transition potenteal region. The weld metal is subjected to the dentritical intergranular corrosion, and the base metal to the intergranular corrosion in the transpassive potential region. The nobler the etching potential in the transpassive potential region and the longer the etchion time, the greater the intergranular corrosion rate will be. The welding metal and the base metal display the same tendency of corrosion in the medium and no deterioration results from the galvanic corrosion between them. By metallographical examination and electron probe microanalysis, it is found that the precipitation of σ-phase exists at the grain boundary of the welding metal.
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Received: 25 June 1992
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