应用电化学方法研究了磷酸锌在水溶液和醇酸涂层中的缓蚀性能和缓蚀作用机理。磷酸锌在中性水溶液中因受溶解度的限制,并不呈现缓蚀效果。在醇酸涂层中磷酸锌显示了优越的防锈性能,其作用原理很可能是:(1)磷酸锌增加了涂层对水的渗透以及对氧分子和氯、钠等离子扩散的阻力;(2)当涂层下氧浓差电池工作时,磷酸锌对局部电池的阳极液和阴极液起着缓冲作用,而反应的产物对金属起缓蚀作用。
The difference of inhibition mechanism of zinc phosphate in aqueous solution and in alkyd coating has been studied by using electrochemical techniques. Zinc phosphate is hardly inhibitive to bare steel in neutral solution containing chloride ions,but it behaves as an outstanding inhibitive pigment in alkyd coating. The reasons for the high inhibiting effect in the coating may be as follows: (a)zinc phosphate increases the resistance of the coating to the permeation of water and to the diffusion of oxygen or other corrosive ions through the paint film; (b)during the operation of the differential aeration cell beneath the coating,zinc phosphate imparts excellent buffering action to the anolyte and catholyte and acts as an effective inhibitor to the base metal, consequently the blistering tendency of the paint film at the cathode and the corrosion rate of base metal at the anode are lowered.
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