Ce和W对444铁素体不锈钢耐点蚀性的影响

doi:10.13228/j.boyuan.issn1006-9356.20220115

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Abstract The effect of Ce and W addition on pitting corrosion resistance of ferritic stainless steel in the solution containing Cl^- was studied by electrochemical and gravimetric tests. The critical pitting temperature (CPT) of ferritic stainless steel with different Ce and W contents was measured by potentiostatic polarization method. The results show that addition of both Ce and W can inhibit the corrosion dissolution of ferritic stainless steel in FeCl₃, and W element is enriched on corrosion pits bottom of stainless steels containing W. Both Ce and W increase the critical pitting temperature value of ferritic stainless steel in 5%NaCl solution. When the mass fraction of W element reaches 1%, the repassivation ability of corrosion pits can be significantly enhanced. The addition of Ce and W can increase the pitting potential of ferritic stainless steel, decrease the pitting current density, and improve the pitting resistance of the stainless steel. Ferritic stainless steels with different components show stable passivation in neutral solution containing chlorine, while the addition of Ce and W can improve the stability of passivation film and expand the range of passivation zone.

Key words： ferritic stainless steel pitting corrosion resistance rare earth element tungsten passive film

Received: 14 February 2022

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20220115 OR http://www.zgyj.ac.cn/EN/Y2022/V32/I6/79

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