(中國科學(xué)院 金屬研究所 材料環(huán)境腐蝕試驗(yàn)研究中心，
沈陽 110015)
摘 要: 對鎂合金傳統(tǒng)化學(xué)鍍工藝進(jìn)行了改進(jìn)， 避免了使用氫氟酸和六價(jià)鉻等有毒物質(zhì)。 采用化學(xué)鍍與化學(xué)復(fù)合鍍相結(jié)合方法， 在AZ91D鎂合金上獲得了Ni-P-ZrO2納米化學(xué)復(fù)合鍍層，并研究了新工藝化學(xué)鍍前處理和鎳沉積機(jī)理及復(fù)合鍍層的結(jié)構(gòu)和性能。 結(jié)果表明： 新工藝方法獲得的Ni-P鍍層更均勻、致密， 耐蝕性優(yōu)于傳統(tǒng)工藝化學(xué)鍍層； Ni-P-ZrO2復(fù)合鍍層與AZ91D合金基體在3.5%NaCl 溶液中的動(dòng)電位極化曲線對比表明， 該復(fù)合鍍層對鎂合金可以起到明顯的保護(hù)作用；從磨損實(shí)驗(yàn)結(jié)果可見， Ni-P鍍層的磨損質(zhì)量損失率幾乎為Ni-PZrO2鍍層的3倍， 說明ZrO2納米粉的加入能改善鍍層的耐磨性。
關(guān)鍵字: A291D鎂合金； Ni-P-ZrO2鍍層；化學(xué)復(fù)合鍍； 耐蝕性； 耐磨性
（Environmental Corrosion Center, Institute of Metals Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract: Traditional process of electroless Ni-P plating on AZ91D magnesium alloy was improved, and the poisonous substances of hydrofluoric acid and Cr6+ were not used. The mechanism of pretreatment and nickel initial deposition for new process was investigated. Meantime, the process of Ni-P-ZrO2 composite plating was developed, and the microstructure and properties of the composite coating were studied. The results show that the Ni-P coating prepared with new process is more compact and uniform, and the corrosion resistance is superior to that of traditional process Ni-P coating. The potentiodynamic polarization curves in 3.5%NaCl solution indicate that the Ni-P-ZrO2 composite coating could provide adequate protection to magnesium alloy substrate. The wear mass loss of Ni-P coating is nearly twice more than that of Ni-P-ZrO2 coating, implying that the wear resistance of the composite coating is improved due to the co-deposition of ZrO2 nanometer particles.
Key words: AZ91D magnesium alloy; Ni-P-ZrO2 coating; electroless composite plating; corrosion resistance; wear resistance
