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| RELATIONS BETWEEN THE NON—SENSITIZED INTERGRANULAR CORROSION AND THE POTENTIALS FOR UREA GRADE 316L STAINLESS STEEL |
| Wang Yueping Yu Fuzhou Beijing Institute of Chemical Technology |
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Abstract By using the potentiostatic etching method, the behavior of non-sensitized intergranular corrosion (IGC) for as-received 316L stainless steel (SS) at different potential regions were studied in autoclave containing urea solution. The propagation of non-sensitized IGC and the relation of IGC to potential values were investigated in sulfuric acid at ambient temperature. It is found that only general corrosion occurs for as-received 316L SS both in the active potential region and in the active-passive transition potential region, but both general corrosion and IGC occur simultaneously in the transpassive potential region. With potentiostatic etching in the transpassive region, IGC is deepened and broadened with increased etching electric quantities (with etching time), and the cross section of corroded specimen is in "V" shape. Under the condition of potentiostatic etching with equal electric quantities in the transpassive region, the nobler the etching potential, the greater will be the IGC rate (V_(IGC)) and the total corrosion rate(V_t), the less will be the ratio of IGC rate to total corrosion rate (V_(IGC)/V_t). The non-sensitized IGC of austenitic SS may be lightened by using high purity SS.
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Received: 25 April 1988
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