Corrosion behavior and passive film properties of nickel-based alloy in phosphoric acid

Corrosion Communications Pub Date : 2023-03-01 DOI:10.1016/j.corcom.2022.06.003

Yuan Zhang , Xian Zhang , Siyu Chen , Jing Liu , Teng Li , Lingyu Wang , Kaiming Wu

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引用次数: 5

Abstract

Corrosion behavior and passive film properties of nickel-based alloy (Inconel 625) in phosphoric acid were investigated, by means of a variety of electrochemical methods combined with surface analysis techniques. Results showed that Inconel 625 exhibited strong passive behavior in phosphoric acid but their corrosion resistance was deteriorated with increasing concentration of phosphoric acid. The increasing concentration of phosphoric acid also accelerated the corrosion rate. The passive film of Inconel 625 was composed of an inner layer rich in Cr₂O₃ and an outer layer rich in FeOOH. The initial corrosion of Inconel 625 in phosphoric acid originated from the complex inclusions composed of N, Nb and Ti with a corn rich in Mg and O. At concentrations lower than 1 mol/L, inner layer of the passive film remained intact and only the outer layer was damaged. At concentrations of phosphoric acid higher than 1 mol/L, both the inner and outer layers were destroyed. The insoluble corrosion products Fe phosphate compounds precipitated on the surface of Inconel 625, which accumulated with increasing concentrations of phosphoric acid and became a loose layer covering the surface of Inconel 625 at concentrations of phosphoric acid higher than 1 mol/L.

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镍基合金在磷酸中的腐蚀行为及钝化膜性能

采用多种电化学方法结合表面分析技术，研究了镍基合金（Inconel 625）在磷酸中的腐蚀行为和钝化膜性能。结果表明，铬镍铁合金625在磷酸中表现出较强的钝化性能，但随着磷酸浓度的增加，其耐蚀性有所下降。磷酸浓度的增加也加速了腐蚀速率。铬镍铁合金625的钝化膜由富含Cr2O3的内层和富含FeOOH的外层组成。Inconel 625在磷酸中的初始腐蚀源于N、Nb和Ti与富含Mg和O的玉米组成的复杂夹杂物。在低于1mol/L的浓度下，钝化膜的内层保持完整，只有外层受损。在磷酸浓度高于1mol/L时，内层和外层都被破坏。不溶性腐蚀产物磷酸铁化合物沉淀在铬镍铁合金625表面，随着磷酸浓度的增加而积累，在磷酸浓度高于1mol/L时成为覆盖铬镍铁合金表面的松散层。

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来源期刊

Corrosion Communications

CiteScore

7.30

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0.00%

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