結(jié)構(gòu)和耐蝕性的影響
(哈爾濱工業(yè)大學(xué) 應(yīng)用化學(xué)系， 哈爾濱 150001)
摘 要: 在鈦合金表面用微等離子體氧化能產(chǎn)生一層陶瓷膜。將重鉻酸鉀引入磷酸鹽電解液將使鈦合金微等離子體氧化過程的槽電壓升高，經(jīng)對所得微等離子體氧化陶瓷膜表面和截面進行掃描電鏡(SEM)形貌觀察，發(fā)現(xiàn)重鉻酸鉀的加入使陶瓷膜的致密性增加。XRD分析表明，不同電解液中所得膜層都是以銳鈦礦型TiO2為主晶相，同時還含有少量的金紅石型TiO2，重鉻酸鉀的加入使銳鈦礦型TiO2的含量增加。 對膜層進行電偶電流和循環(huán)伏安測試表明，重鉻酸鉀的加入使所得的膜層對金屬的接觸腐蝕降低，抗點腐蝕能力大大提高。
關(guān)鍵字: 陶瓷膜； 微等離子體氧化； 抗腐蝕能力
anticorrosive properties of ceramic film grown on
Ti alloy by micro-plasma oxidation
XIN Shi-gang, BENG Hong-qi
（Department of Applied Chemistry， Harbin Institution of
Technology， Harbin 150001, P.R.China）
Abstract: A layer of ceramic film can be grown on Ti alloy by the micro plasma oxidation. In order to improve the properties of ceramic film， potassium dichromate is added into the solution of phosphate. SEM， XRD and circling volt-ampere were employed to characterize the ceramic film. It is found that ceramic film with 20μm becomes more compact; it consists of anatase and rutile TiO2, and anatase TiO2 is dominant; its anti-point corrosive property is greatly improved and its contact corrosion to Cu decreases because of the addition of potassium dichromate.
Key words: ceramic film； micro-plasma oxidation; anticorrosive property
