植酸在金属防腐中的应用研究

用失重法研究了植酸对金属的阻蚀性。分别以0.1 mol/L HCl、0.1 mol/L NaCl或0.1 mol/L NaOH为介质,配置不同植酸浓度的(空白自来水,0.5%,1%,1.5%,2%)溶液,并与相同介质下1.5%亚硝酸钠或1.5%磷酸二氢锌的溶液相比较。实验表明,对于铝、锌和铁三种金属,植酸对铝的防腐率最为显著,其中尤以植酸在NaCl介质中对铝的防腐性能最优,最佳防腐浓度为0.5%;对于锌、铁,防腐作用最佳的是空白自来水介质的1.5%磷酸二氢锌钝化液。

Application of non-toxic phytic acid in metal protection

The application of phytic acid in metal protection was researched by weight-loss method.Using 0.1 mol/L HCl,0.1 mol/L NaCl or 0.1 mol/L NaOH respectively as the medium,different concentrations of phytic acid(blank water,0.5%,1%,1.5%,2%) were prepared,compared with the solution of 1.5% NaNO2 or 1.5% Zn(H_2PO_4)_2.The result of the experiment is as follows:for Al, Zn and Fe,the corrosion rate of phytic acid to Al is the best,and its best media is NaCl,the best concentration is 0.5%.For Zn and Fe,its best media is 1.5% Zn(H_2PO_4)_2 of blank water.