Study on influence of the PTA-P welding process parameters on corrosion behavior of Inconel 625 coatings

• Published in: Matéria Vol. 24; no. 1
• Main Authors: Santos, Aureliano Xavier dos, Maciel, Theophilo Moura, Costa, Josiane Dantas, Sousa, Mikarla Baía de, Prasad, Shiva, Campos, Ana Regina Nascimento, Santana, Renato Alexandre Costa de
• Format: Journal Article
• Language: English
• Published: Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro; em cooperação com a Associação Brasileira do Hidrogênio, ABH2 2019
• Subjects: CONSTRUCTION & BUILDING TECHNOLOGY; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Plasma transferred arc-welding; coatings; corrosion; dilution
• ISSN: 1517-7076; 1517-7076
• DOI: 10.1590/s1517-707620190001.0619

ABSTRACT In the present work, PTA welding process was used to investigate the influence of welding parameters on the dilution, microhardness and corrosion resistance of Inconel 625 alloy coatings on the API 5L X70 grade steel. The electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization (LPP) measurements were used to study the protection properties of the deposited layer when immersed in a 3.5% NaCl solution. The results of EIS and LPP have shown that the corrosion resistance results were more satisfactory for coatings with higher dilution index. The results also showed that the dilution values D (%)varied from 15.33% to 4.39% at the maximum (18.99 kJ/cm) and the minimum (8.34 kJ/cm) welding energy levels. The most relevant dilution value obtained was 4.39%.