超音速火焰喷涂 Ni 基复合涂层的抗高温腐蚀性能

Waste incinerator components suffer sever high temperature corrosion damage in working condition due to the corrosion of the waste and the corrosion of incineration products. In order to alleviate the high temperature corrosion of the incinerator, Cr₃ C₂ - NiCr coatings were deposited via high velocity oxy - fuel spraying method, and the high temperature corrosion resistance of the coatings was studied. The prepared coatings were tested under high temperature oxidation, molten salt corrosion and atmosphere corrosion environments, and both the corrosion behavior and corresponding products of the above-mentioned cermet coatings were evaluated. The corrosion test results showed that under the high temperature oxidation and molten salt corrosion conditions, with the increase of corrosion temperature from 450 ℃ to 650 ℃, the corrosion rates of the coatings increased. Under the atmosphere corrosion condition, the corrosion rates of the coatings increased with the rising of corrosion temperature from 550 ℃ to 650 ℃ .