Effects of Precipitates and Inclusions on Corrosion Resistance of L80-9Cr Steel
The effects of Cr23C6 precipitates and Al2O3 inclusions on the corrosion resistance of L80-9Cr steel were studied by electrochemical test and FeCl3 pitting test.The results show that the precipitation and aggregation of Cr23C6 in the original martensitic lath bundles increased the degree of lattice distortion at the small-angle grain boundaries,making it have higher electrochemical activity and reducing the corrosion resistance of the material.On the other hand,the precipitation of Cr23C6 led to the formation of the surrounding Cr-depleted area,which increased the tendency of pitting corrosion of the material.In addition,the existence of Al2O3 inclusions also provided a favorable position for the initiation and development of pitting corrosion,and the combined effect of the two led to the severe pitting corrosion of L80-9Cr steel.
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