Abstract
With the gradual depletion of shallow resources, the petroleum industry is developing toward ultradeep wells and high‐speed drillings, and the problems of corrosion and erosion failure of drill pipe materials are becoming more and more serious. On the basis of not destroying the excellent mechanical properties of S135 drill pipe steel, three kinds of coatings, 20% Al‐80% Zn, 30% Al‐70% Zn, and 40% Al‐60% Zn, are cold sprayed on S135 steel. The morphology of the coating is observed, and the bonding strength, porosity, hardness, and corrosion resistance of the coating are tested. Results show that the bonding mechanism between the powder particles and the substrate of the three coatings is mainly mechanical occlusion. From the substrate to the coating surface, the hardness value decreases gradually. With the increase of Al powder content, coating bonding strength increases, coating becomes more compact, and porosity decreases. Corrosion test results show that three coatings can protect the substrate. The density of corrosion products on the coating surface increased with the increase of the Al content. Corrosion potential of the three coatings is lower than that of the substrate, and the corrosion rate of the three coatings is lower than that of the substrate.
Highlights
With the gradual depletion of shallow resources, the petroleum industry is developing toward ultradeep wells and high-speed drilling
S135 steel is widely used as drill pipe material because of its excellent mechanical properties [1]
In the process of service, it is often affected by the corrosive medium, which makes the joint usually have corrosion behavior, so more than 80% of drill pipe accidents occur at joints
Summary
With the gradual depletion of shallow resources, the petroleum industry is developing toward ultradeep wells and high-speed drilling. E drill pipe joint is the most important part of the drilling string It plays the role of connecting, transforming, and transmitting torque. E protective coating with excellent corrosion resistance and wear resistance can be prepared by thermal spraying or enamel technology. It has been widely used and developed because of its mature technology, convenient preparation, and flexible application, but there are inevitably many defects [5,6,7,8,9]. Advances in Materials Science and Engineering makes cold spraying technology have broad application prospects in corrosion protection and preparation of high conductivity coatings, repair of damaged metal components, and manufacture of metal additives. Microstructure, morphology, porosity, hardness, bonding strength, and corrosion resistance of three coatings were observed and studied
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