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Abstract The charcteristie pitting potential measurements, scanning micro-reference electrode technique, XPS, electron probe, SEM were used to evaluate the suppression of the initiation and propagation of pitting corrosion of AISI 321 stainless steel in neutral NaCl aqueous solution by addition of Na_2MoO_4, HEDP+ZnSO_4 and their mixture. The results showed that Na_2MoO_4 is an efficient inhibitor for both the initiation and the propagation of pitting corrosion and has marked synergic inhibition with HEDP+ZnSO_4. The inhibition of the mixture inhibitor is related to the formation of insoluble MoCl_3. It is found that Cl~- content markedly increase inside and outside pits of the film and that the initiation potential E_z of instable micro pits raises, the difference between breakthrough potential E_b and E_z increases.
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Received: 25 June 1992
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