A study on the intergranular corrosion and pitting resistance of Inconel 625 coating by PTA-P

被引：15

作者：

Lorenzoni, Raphael Amorim ^{[1
]}

Gasparini, Ricardo Paris ^{[1
]}

dos Santos, Ana Claudia ^{[1
]}

Luz, Temistocles de Sousa ^{[1
]}

Severo de Macedo, Marcelo Camargo ^{[1
]}

机构：

[1] Univ Fed Espirito Santo, Dept Mech Engn, Vitoria, Brazil

来源：

CORROSION ENGINEERING SCIENCE AND TECHNOLOGY | 2019年 / 54卷 / 01期

关键词：

Nickel; potentiostatic; pitting; weld overlay; plasma-transferred arc; DILUTION;

D O I：

10.1080/1478422X.2018.1533677

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study aims to evaluate the influence of heat input and dilution on the corrosion behaviour of a weld overlay coating of Inconel 625 deposited using a plasma transferred arc process. Cyclic potentiodynamic polarisation, double-loop electrochemical potentiometric reactivation and critical pitting temperature (CPT) experiments were performed to determine sensitisation and pitting corrosion resistance of the coating, besides microstructural characterisation and microhardness testing. The overlay showed to be resistant to sensitisation in all cases. Within the scope of this study, only the CPT test was able to cause pitting in the alloy, which showed that increments of the specimen's chemical dilution and heat input induced a lower CPT. This is mainly due to different chemical compositions among the distinct phases present in the coating.

引用

页码：62 / 74

页数：13

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