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采用超音速等离子喷涂技术在船舶用20钢表面喷涂不同混合金属粉末,实现表面金属改性,研究和分析了表面金属改性对其耐盐雾腐蚀、耐电化学腐蚀和耐人造酸雨全浸腐蚀能力的影响。结果表明:喷涂混合金属粉末的表面金属改性能有效改善船舶用20钢的耐蚀性能,特别是喷涂含钪混合金属粉末,改善效果尤为明显。与未进行表面改性试样相比,经过超音速等离子喷涂含钪混合金属粉末的试样,其240 h盐雾腐蚀后的质量损失率降低87%、6 mol/L氢氧化钾溶液中的自腐蚀电位正移13.64%、人造酸雨环境中的腐蚀速率下降91.3%。
The supersonic plasma spraying technique was used to spray different mixed metal powders on the surface of 20 steel for ships to realize the surface metal modification. The effects of surface metal modification on its salt spray resistance, electrochemical corrosion resistance and acid rain resistance were studied and analyzed The impact of ability. The results show that the surface modification of spray mixed metal powder can effectively improve the corrosion resistance of 20 steel used in shipbuilding, especially spraying mixed metal powder containing scandium to improve the effect. Compared with the non-surface modified samples, the mass loss rate of the scandium mixed metal powder after supersonic plasma spraying was reduced by 87% after 240 h salt spray corrosion, and the mass loss rate in 6 mol / L potassium hydroxide solution The self-corrosion potential is shifting 13.64%, and the corrosion rate in artificial acid rain environment is decreased by 91.3%.