自制PVA金属防锈液对纯铜缓蚀性能的影响

在浓度为1.0 mol/L的HCl酸性介质中分别加入体积为0,100,200,300,400,500 m L的自制PVA水溶性金属防锈液,采用失重法、极化曲线法和扫描电子显微镜表面分析法,测试纯铜在混合溶液中的缓释率。失重法测试结果表明,P V A金属防锈液对纯铜具有较好的缓蚀作用,且防锈液添加体积越大,其失重越小,缓蚀效果越好,其缓蚀率可达86.7%;极化曲线法测试结果表明,PVA金属防锈液对纯铜具有较好的缓蚀作用,且防锈液添加体积越大,体系的腐蚀电流密度越小,缓蚀率越高,其缓蚀率可达85.9%;扫描电子显微镜表面形貌分析结果表明,随着防锈液添加体积的增大,纯铜表面的孔洞数量减少,孔洞面积也减小,当加入500 m L防锈液时,纯铜表面趋于平整,这说明防锈液对纯铜具有较好的缓蚀效果。

Corrosion Inhibition of a Homemade PVA Antirust Liquid Applied to Pure Copper

The slow release rate of pure copper in the mixed solution was tested by putting a volume of 0, 100, 200, 300, 400, 500 mL homemade PVA metal antirust liquid into acid medium HCl with concentration of 1.0 mol/L based on weight-loss method, polarization curve method and surface analysis of scanning electron microscope (SEM). The weight loss method showed that PVA water-soluble metal antirust liquid exerted a better corrosion inhibition on pure copper. With the increase in the volume of antirust liquid, the weight loss decreased with a better corrosion inhibition effect as the corrosion rate was 86.7%; Polarization curve method suggested that PVA water-soluble metal antirust liquid demonstrated good corrosion inhibition on pure copper, and with the increase in the volume of antirust liquid, the corrosion current of the system decreased with the anti corrosion rate being 85.9%; Scanning electron microscope (SEM) surface topography analysis indicated that the increase of antirust liquid resulted in the decrease in the number of holes on the surface of pure copper with the reduced cavern area. With 500 mL antirust liquid added, pure copper surface tended to smooth, suggesting that antirust liquid of pure copper had good corrosion inhibition effect.