【摘要】 以磷酸二氢铝为基料制备水性含铝无机磷酸盐涂料,采用空气喷涂方式在45#钢上制备了4种不同磷酸二氢铝含量的铝基涂层,基料含量分别为12%、14%、16%、18%。通过热重分析、扫描电镜、电化学阻抗谱、极化曲线等测试方法对铝基磷酸盐涂层的聚合固化、微观结构、耐腐蚀性进行了表征。结果表明:随着磷酸二氢铝含量的增加,涂层表面孔隙率降低,结构更加致密,且涂层的自腐蚀电位升高,自腐蚀电流密度明显降低,涂层耐腐蚀性不断提高,在磷酸二氢铝含量为18%时,涂层结构最为致密,耐腐蚀性能优异,且对基体钢保护效果显著。更多还原

【Abstract】 In this work,aqueous aluminum phosphate coatings were prepared with aluminum dihydrogen phosphate binder.The coatings with four different amount of aluminum dihydrogen phosphate contents,i.e.12%,14%,16% and 18% respectively,were air sprayed on 45~# steel substrate.The polymerization curing,microstructure and corrosion resistance of Al-based phosphate coatings were characterized by thermogravimetric analysis,scanning electronic microscope,electrochemical polarization impedance spectroscopy and polarization curves.The results showed that with the increase of the amount of aluminum dihydrogen phosphate in aqueous aluminum phosphate coatings,the porosity of the coatings was reduced,and the microstructure appeared to be denser.In addition,as the aluminum dihydrogen phosphate binder increased,the self-corrosion potential(Ecorr) of the coatings was increased,while the self-corrosion current density was significantly reduced,which resulted in the improvement of the corrosion resistance of the coatings.When the content of the aluminum dihydrogen phosphate was 18%,the microstructure of the coatings was the most densed,which exhibited excellent corrosion resistance with a significant protective effect on the steel substrate.更多还原