糖苷对碱性溶液中钢筋表面钝化膜性能的影响

Effect of Pentaerythritol Glycoside on Performance of Passive Film Formed on Steel Rebar in Saturated Ca(OH)_2 Solution Containing 3.5%NaCl

利用动电位极化和表面形貌观察技术,结合电容-电位曲线测量和Mott-Schottky分析,探讨了糖苷化合物对钢筋在含3.5%NaCl的Ca(OH)2饱和溶液中的缓蚀行为和表面钝化膜性能的影响。结果表明,糖苷阻锈剂的加入可有效减缓钢筋的腐蚀,促进钢筋表面的钝化,提高钢筋耐Cl-侵蚀能力;阻锈剂虽未改变钢筋表面钝化膜的半导体性能,但钝化膜内载流子密度却显著下降;钝化膜致密性分析表明,随糖苷浓度增大,钢筋表面钝化膜稳定性和致密性逐渐增强,耐蚀性提高。

The effect of PG(pentaerythritol glycoside) on the performance of the passive film on steel rebar in Ca(OH)2saturated solution containing 3.5%NaCl, which was designed to simulate solutions in concrete pores, was investigated by mean of polarization curve measurement, MottSchottky analysis technique and surface analysis. The results showed that the PG could enhance the stability of the adsorption film formed on the metal surface. The curves of Csc-2vs E of the steel rebar electrodes follow a linear Mott-Schottky(M-S) relationship with a positive slope in the range of potential from-0.5 to-0.1 V(vs SCE) in the M-S measurements, suggesting the passive film formed on the steel rebar surface was n-type semi-conductor. Moreover, with increasing concentration of inhibitor, the carrier density in passive film decreases, indicating that the passive film formed on steel rebar surface in the presence of PG was more compact and stable rather than that in the absence of inhibitor, and the corrosion resistance of passive film is gradually enhanced.