Avaliação da resistência a corrosão de revestimentos à base de níquel depositados em aços API 5L X70 por soldagem plasma pó.

Abstract

Corrosion failures are the leading ause of leakage in the oil industry. For this reason, the use of new materials with better resistance to this phenomenon has been very studied. One of the most used alternatives, due to the lower cost involved, is the application of coatings with these materials through welding processes. this work has the objective of evaluating the corrosion resistance of coatings based on nickel alloys in different welding parameters. As base metal using was API 5L X70 steel sheets and as addition metal, it binds to the Ni base of Nickel, Inconel 625 in a powder. as experimental tool was used experimental planning 2³ plus central point, associated to the surface response technique (MSR). The geometric characteristics, dilution, iron content and finally, electrochemical measurements of corrosion were made, were coated and subjected to heat treatment. the experimental results indicate that lower dilution values and iron content provide high corrosion resistance.