(1. 南昌航空大學材料科學與工程學院，南昌 330063；
2. 南昌航空大學土木建筑學院，南昌 330063)
摘 要: 制備Fe41Co7Cr15Mo14C15B6Y2塊體非晶合金與非晶合金涂層，通過化學腐蝕浸泡法分析兩者腐蝕前后的相對表面功函數，從而研究兩者致密度差值對耐蝕性的影響。采用動電位極化曲線結合交流阻抗測試分析涂層與塊體在0.5 mol/L H2SO4溶液中的電化學腐蝕特性，進一步得到孔隙在腐蝕過程中的作用。結果表明：塊體非晶的自腐蝕電位高于涂層的，其電流值比涂層的小一個數量級，其擬合電路為R(QR)型；由于孔隙及表面鈍化膜等影響因素的存在，涂層的擬合電路為(R(Q(R(QR)))型。通過電子探針實驗得出涂層與塊體存在9.25%的孔隙率差值，導致了50 meV的功函數差值。孔隙尺寸越大、數量越多則合金耐蝕性越差。腐蝕前后塊體非晶合金的功函數值都比涂層的高，且表現出更強的耐蝕性。
關鍵字: 鐵基大塊非晶合金；鐵基非晶涂層；致密度；相對表面功函數；耐蝕性
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. School of Civil Architecture, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:Fe41Co7Cr15Mo14C15B6Y2 bulk amorphous alloys and amorphous coating alloys were prepared, and the effects of both density difference on the corrosion resistance were investigated by analyzing the relative surface work function of samples before and after chemical corrosion. The role of porosity in the corrosion process can be obtained by analyzing electrochemical corrosion characteristic of coating and bulk alloys in 0.5 mol/L H2SO4 solution based on the driven potential polarization curves and AC impedance measurement. The results show that the corrosion potential of coatings alloys is higher than that of bulk alloys, the current value of bulk alloys is one order magnitude smaller than that of coatings alloys, and the fitting circuit of bulk alloys is R (QR) type. Because of the influence of porosity and surface passivation film, the fitting circuit of the coating alloys is (R(Q(R(QR))) type. The electron probe experimental results show that the porosity difference of coating and bulk alloy is 9.25% which leads to the work function difference of 50 meV. The pore size is bigger and the pore number more, the corrosion resistance of alloys is worse. Both before and after corrosion, the work function of the bulk amorphous alloy is higher than that of the coating alloys, showing the bulk amorphous alloy has stronger corrosion resistance.
Key words: Fe-based bulk amorphous alloy; Fe-based amorphous coating; relative density; relative surface work function; corrosion resistance
