CAJ | 학술논문

采用电化学两步反应在纯钛基体表面制备K2Ti6O13/TiO2复合涂层，对其形貌、相组成和电化学耐腐蚀性能进行研究，并与传统化学方法制备的涂层进行比较。结果表明，电化学法制备的涂层为多孔网状结构，由内层阻碍层和外层多孔层的双层膜组成，可抑制Ti基体过钝化时的O2析出；KOH电解液作用时，随电流密度增加，涂层阻抗值减小，多孔层厚度逐渐增加；电流密度大于20 mA/cm2时，涂层发生脱落，但其耐腐蚀性能仍高于化学方法制备的涂层。因此通过电化学方法制备的涂层可改善Ti基体的腐蚀行为，使其具有更优异的耐腐蚀性能。
채용전화학량보반응재순태기체표면제비K2Ti6O13/TiO2복합도층，대기형모、상조성화전화학내부식성능진행연구，병여전통화학방법제비적도층진행비교。결과표명，전화학법제비적도층위다공망상결구，유내층조애층화외층다공층적쌍층막조성，가억제Ti기체과둔화시적O2석출；KOH전해액작용시，수전류밀도증가，도층조항치감소，다공층후도축점증가；전류밀도대우20 mA/cm2시，도층발생탈락，단기내부식성능잉고우화학방법제비적도층。인차통과전화학방법제비적도층가개선Ti기체적부식행위，사기구유경우이적내부식성능。
The K2Ti6O13/TiO2 coatings were prepared on pure titanium substrate by electrochemical two-step reaction. The morphologies, phase composition and electrochemical corrosion resistance properties of the coatings were studied and compared with the coating prepared by traditional chemical treatment. The results show that the coatings exhibiting porous network structure are composed of inner barrier layer and outer porous layer, and can inhibit the release of O2 in the process of trans-passivation of Ti substrate;during the treatment of KOH electrolyte, both the impedance of coatings and the thickness of porous layer increase with increasing current density;the coating peels off at current density above 20 mA/cm2, however, the corrosion resistance property is still higher than that of coating prepared by chemical treatment. Thus, the coatings prepared by electrochemical method can improve the corrosion behavior of Ti substrate, providing it more stable corrosion resistance property.