Influência da corrente e taxa de alimentação na resistência à corrosão de revestimento à base da liga INCONEL 625 depositada por PTA-P

Abstract

Nowadays, the oil exploration process is still greatly affected by pipeline failures, which delay the production schedule, creates high maintenance costs, and creates risks to the environment and health. Thus, the search for less costly alternatives to minimize these impacts is constant, especially against failures due to corrosion. One of these is the use of materials that have high mechanical and anticorrosive properties in the form of coatings, which could be deposited by welding. The objective of this study was to evaluate the effects of the welding current and feed rate on the corrosion resistance of coatings based on the Inconel 625 alloy, deposited by PTAP process in API 5L X70 steel. The parameters were optimized using the factorial experimental design and the results analyzed by the Response Surface Methodology (RSM). Three deposits with ½ overlap were performed by PTA-P welding process, followed by an analysis of the dilution, iron content and corrosion resistance by electrochemical measurements. The coatings obtained with lower welding current and feed rate values showed better anti-corrosion properties.