本文選題：脈沖電鍍 + Ni-Cr-Mo合金鍍層　； 參考：《熱加工工藝》2017年18期

【摘要】：采用脈沖電鍍法在Q235鋼表面制備Ni-Cr-Mo合金鍍層。利用掃描電鏡(SEM)、輝光放電光譜儀(GDS)、Tafel曲線和電化學(xué)阻抗譜(EIS)考察了施鍍時間對鍍層表面形貌、形成過程、鍍層厚度、元素含量和耐蝕性的影響。結(jié)果表明:鍍層由粒狀結(jié)構(gòu)形核、長大并逐層疊加形成;鍍層的形成存在一個孕育期,孕育期后一定時間內(nèi)鍍層增厚較為困難,施鍍時間繼續(xù)增大,鍍層可順利增厚。隨施鍍時間的增大,鍍層鎳含量增大,鉻含量減小,鉬含量減小。在3.5%NaCl溶液中,鍍層耐蝕性先增強后減弱。施鍍時間為50 min時制備的鍍層具有最大的自腐蝕電位(-0.355 V)、最小的腐蝕電流密度(0.006μA·cm~(-2))和最大的電荷轉(zhuǎn)移電阻(26544Ω·cm~2),耐蝕性最好。
[Abstract]:Ni-Cr-Mo alloy coating was prepared on Q235 steel by pulse electroplating. The effects of plating time on the surface morphology, formation process, coating thickness, element content and corrosion resistance were investigated by means of scanning electron microscope (SEM), glow discharge spectrometer (GDS), Tafel curve and electrochemical impedance spectroscopy (EIS). The results showed that the coating was nucleated by granular structure, grew up and formed layer by layer superposition, and there was a incubation period in the formation of the coating. It was difficult to increase the coating thickness within a certain time after inoculation, and the plating time continued to increase, and the coating could be thickened smoothly. With the increase of plating time, the nickel content, chromium content and molybdenum content of the coating increase. In 3.5%NaCl solution, the corrosion resistance of the coating was first enhanced and then weakened. When the plating time is 50 min, the coating has the highest corrosion potential (0.355V), the minimum corrosion current density (0.006 渭 A) and the maximum charge transfer resistance (26544 惟 cm ~ (-2), and the best corrosion resistance.
【作者單位】： 華北理工大學(xué)現(xiàn)代冶金技術(shù)教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51474088)
【分類號】：TQ153

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