摘要
利用硫酸盐和植酸钠反应制备植酸盐,并通过扫描电镜(SEM)、能谱仪(EDS)、红外光谱(FT-IR)、X射线衍射(XRD)对植酸盐进行表征,所制备的植酸盐样品存在明显磷酸基团,为非晶态,表现为球状颗粒,直径在300～400nm.通过滴定实验分析植酸盐在水溶液中的溶解度,通过Tafel极化法、电化学阻抗法、腐蚀浸泡实验研究Q235钢在植酸盐3.5％NaCl浸出液中的腐蚀行为.结果表明,植酸铝浸出液中生成铝酸(Al(OH),)导致Q235钢腐蚀速率加快,植酸镁、植酸钙、植酸锰及植酸锌浸出液中Q235钢腐蚀速率减缓.其中,植酸锌的缓蚀效率能达到92.46％,表现出良好的缓蚀性能.
Abstract
The study on the preparation and properties of new anti-rust pigments is of significance for the development of anticorrosion coatings.In this paper,phytates were prepared by reaction of sul-fates with sodium phytate.The phytates were characterized using SEM,EDS,FT-IR,and XRD analysis.The results showed that the prepared phytates were amorphous containing obvious phosphate groups,and presented as spherical particles with a diameter of 300-400 nm.The solubilities of phytates in aque-ous solution were analyzed through titration test.The corrosion behavior of Q235 steel in phytate-extract-ing solutions,which were acquired by soaking aluminum-,magnesium-,calcium-,manganese-and zinc-phytates,respectively,in 3.5％NaCl solution and then leaching,were studied via immersion test,Tafel po-larization,and electrochemical impedance spectroscopy.The findings revealed that the corrosion rate of carbon steel increased in aluminum phytate-extracting solution due to the production of aluminum-acid(Al(OH)3).However,the corrosion rates decreased in the other four extracting solutions.Notably,the inhi-bition rate of zinc phytate was approximately 92.46％.
基金项目
国家自然科学基金(52001155)
江西省自然科学基金(20212BAB214038)
博士启动基金(EA201901056)
维普
万方数据