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采用电弧喷涂工艺在Q235建筑钢表面制备铝涂层,并对喷涂铝涂层表面刷封孔剂处理。利用扫描电镜和能谱仪对涂层表面进行微观观察和分析,采用CS2350双单元电化学工作站分别对无封孔处理和封孔处理后的试样在3.5%NaCl溶液中模拟大气复杂腐蚀环境进行动电位极化曲线测定。结果表明:经过封孔处理的喷涂铝涂层试样表面孔洞暴露少,未经封孔处理试样表面孔洞多、分布不均匀;在3.5%NaCl溶液中,封孔处理后涂层自腐蚀电流密度降低,相对于Q235钢基体自腐蚀电位提高约900 mV。
The arc spraying process was used to prepare the aluminum coating on the surface of Q235 steel, and the surface of the spray coating aluminum coating was treated by brushing agent. The surface of the coating was observed microscopically and analyzed by SEM and EDS. The CS2350 dual-cell electrochemical workstation was used to simulate the atmospheric complex corrosion environment in 3.5% NaCl solution for the non-porous and sealed samples respectively. Potentiodynamic polarization curve determination. The results show that the surface of the sprayed aluminum coating after the sealing treatment is less exposed, the pores on the surface of the sample are not distributed much and the distribution is not uniform. In the 3.5% NaCl solution, the corrosion current of the coating after the sealing treatment Decreased density, relative to the Q235 steel substrate corrosion potential increased by about 900 mV.