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Oil exploration process is still greatly affected by pipeline failures, which delay the production schedule and create high maintenance costs, 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 alternatives 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 plasma-transferred arc with powder (PTA-P) 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 1⁄2 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 anticorrosion properties.

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