(1. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國家重點實驗室，蘭州 730050；
2. 甘肅聯(lián)合大學(xué) 理工學(xué)院，蘭州 730000)
摘 要: 研究硅酸鹽體系中AZ91D鎂合金恒定小電流密度微弧氧化工藝。采用在相同工作電壓下增大處理面積的原理來提高生產(chǎn)效率和提高微弧氧化膜層的性能。利用TT230數(shù)字式涂層測厚儀、JSM−6700F掃描電子顯微鏡、2206型表面粗糙度測量儀(E34−001)和W−92涂層附著力劃痕實驗機等研究其微觀結(jié)構(gòu)和CHI660C電化學(xué)工作站和UMT−2MT型球－塊往復(fù)式摩擦實驗機進(jìn)行耐蝕性和耐磨性的評定。結(jié)果表明，此工藝穩(wěn)定，可達(dá)到提高工作效率的目的，其微觀結(jié)構(gòu)有利于大幅度提高膜層的耐蝕性和耐磨性。
關(guān)鍵字: AZ91D鎂合金；金屬型鑄造；微弧氧化；電流密度；耐蝕性；耐磨性
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology,Lanzhou 730050, China;
2. College of Science and Technology, Gansu Lianhe University, Lanzhou 730000, China）
Abstract:The invariable small current density process of micro-arc oxidation of magnesium alloy AZ91D were investigated in silicate electrolyte. The work efficiency was enhanced feasibly by the principle of increasing its processing area in the same operating voltage, and the properties of the micro-oxidation coating were enhanced. The microstructures were studied by means of TT230 digital coating thickness gauge, JSM−6700F scanning electron microscope (SEM), 2206 surface roughness measuring instrument (E34−001), W−92 coating adhesion scratch test machine etc, and the corrosion and wear resistance were assessed by CHI660C electrochemistry workstation and UMT−2MT ball－block reciprocating friction tester. The results show that this process is stable and can enhance the work efficiency, the microstructures are advantageous to the significant enhancement of corrosion and wear resistance.
Key words: AZ91D Mg alloy; permanent mould casting; micro-arc oxidation; current density; corrosion resistance; wear resistance
