Study On Anticorrosion And Antiwear Coatings Manufactured By High Frequency Induction Cladding

To extend the life of sucker rod against the corrosion and wear, during quenching & tempering sucker rod using high frequency induction heating technology, the sucker rod is coated anticorrosion and anti-wear coating by cooling coating, and make them metallurgy integrate. Because it is difficult to control cladding technique, layer of surface flows easily, besides surface forming is poor. According to all the reasons listed above, the transient temperature field of different technique of high frequency induction cladding is simulated. The induction magnetic field and the transient temperature distributing between the substrate surface and the coating at the moment of induction heating is obtained. The influence of the technical parameters on the induction heating simulation result is analyzed, and appropriate technical parameters are found. Experiments are carried out according to the numerical simulation results, and the technical parameters obtained from the simulation are used in the experiments. The control factors of the induction heating are studied, the optimum technical condition for induction cladding is found. During experiment, we add 3%,6%,9% rare earth lanthanum oxide to Ni-based alloy in order to improve surface forming poor and high porosity of coating by cool-coated and manufactured coating onto the sucker rod steel integrate high frequency induction heating technology with HVOF technology. Meanwhile XRD, SEM , EPMA and OM analytical methods were utilized to analyze microstructure of cladding coating, to test electrochemistry corrosion and erosion and corrosion wear.The results indicated that the induction frequency is 100 KHz, work current is 1400 A, time of induction heat treatment is 14s, the quality of cladding coating is the highest than other techniques, when Ni-based alloy is added 6% rare earth lanthanum oxide, anticorrosion and anti-wear property of the coating gained is best, and anodic corrosion current is16.34 A/cm2, at 90°jet angle erosive wear weight loss is 2.11 mg/mm2 in 90 min, while cladding, element of coating and substrate diffuse each other under high temperature, meanwhile interface between substrate and coating form white light strip, and main component of interface are Ni-Fe solid solutions, boride and carbide iron. HVOF coatings after induction cladding, the coating and substrate make metallurgy bonding, eliminating layer structure, its corrosion and wear resistance are greatly improved and its structure and property is better than cool-coated.