氩气中1000℃下热处理对碳钢Q235工件表面金属铝粉涂层性能影响  

Effect of heating treatment at 1000℃in argon on the properties of metallic aluminum powder coatings on the workpieces made of carbon steel Q235

作　　者：侯全起 沈少波[1] 方孝红 张政 顾金朗 HOU Quanqi;SHEN Shaobo;FANG Xiaohong;ZHANG Zhen;GU Jinlang(School of Metallurgical and Ecological Engineering,Beijing University of Science and Technology,Beijing100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《材料研究与应用》2020年第2期109-115,共7页Materials Research and Application

摘　　要：为了增强承重普碳钢件的耐海水腐蚀性能和耐500℃高温性能,将两种没有气味的环保型水性纯铝粉涂料在室温下喷涂至Q235普碳钢片表面,制得单层和双层两种铝粉涂层.将涂层试样浸泡在室温质量分数为3.5%的NaCl的模拟海水中,考察涂层的抗腐蚀性能.为提高单层涂层的耐腐蚀性和双层涂层的粘接强度,研究了1000℃氩气处理对涂层性能的影响.实验结果表明:原始单层铝粉涂层试样泡在盐水中2天后就开始生锈,而经过1000℃氩气加热处理10min后,涂层在10天内都没有生锈,同时涂层的粘接强度由11.6MPa增加到14.0MPa;原始双层铝粉涂层试样泡在盐水中10天内没有生锈,经过1000℃氩气加热处理10min后,涂层防腐蚀性能没有降低,而涂层的粘接强度由9.9MPa增加到11.3MPa.XRD表征结果表明,原始双层铝粉涂层表面只有金属铝,经过1000℃氩气加热处理10min后,涂层表面也出现了极少量Al2O3.SEM表征表明:经过1000℃氩气加热处理10min后,单层涂层中球形铝粉颗粒熔化形成了片状颗粒,片状颗粒层在垂直于涂层方向的间隙明显减少,这可能是单层铝粉涂层经1000℃氩气加热10min后防腐性能明显提高的原因;球形铝粉颗粒熔化也导致了涂层粘接强度的增加.In order to enhance the seawater-corrosion resistance and high temperature of 500 ℃ resistance of carbon steel parts for load-bearing, two kinds of odorless environmentally-friendly water-based pure aluminum powder slurries are sprayed on the surface of Q235 carbon steel sheets at room temperature to obtain single-layer and double-layer aluminum powder coatings. The coating samples were immersed in simulated seawater made of 3.5 wt% NaCl at room temperature to examine the corrosion resistance of the coatings. In order to improve the corrosion resistance of the single-layer coating and the adhesive strength of the two-layer coating, the effect of 1000 ℃ argon treatment on the coating properties was studied. It was found by experiment that the original single-layer aluminum powder coated sample immersed in brine rusted after 2 days, while the coating sample treated at 1000 ℃ argon for 10 min did not rust within 10 day and its adhesive strength increased from original 11.6 MPa to 14.0 MPa. The original double-layer aluminum powder coating sample did not rust in the brine for 10 days. After 1000 ℃ heating in argon for 10 min, the coating corrosion resistance did not reduce, and the coating adhesive strength increased from original 9.9 MPa to 11.3 MPa. XRD characterization showed that the surface of the original double-layer aluminum powder coating was composed of only metallic aluminum. After heating for 10 min at 1000 ℃ in argon, a small amount of Al2O3 also appeared on the surface of the coating. The SEM characterization showed that after heating at 1000 ℃ in argon for 10 min, the spherical aluminum powder particles in the single-layer coating melted to form tabular grains, which significantly reduced the interparticle gaps perpendicular to the coating direction. This might be the reason why the corrosion resistance of the single-layer aluminum powder coating was significantly enhanced after the sample was heated at 1000 ℃ in argon for 10 min. The melting of the spherical aluminum powder particles als

关 键 词：碳钢防腐蚀涂层 金属铝粉涂层 耐海水腐蚀性 涂层粘接强度 氩气中1000℃加热处理 

分 类 号：TG174[金属学及工艺—金属表面处理]