( 1.東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004;
2. 沈陽理工大學(xué) 環(huán)境與化學(xué)工程學(xué)院， 沈陽 110168)
摘 要: 以硫酸鎳為主鹽， 采用正交實(shí)驗(yàn)確定了鎂合金“無氟綠色環(huán)保”堿性化學(xué)鍍鎳鍍液成分及操作條件。 選擇適合鎂合金化學(xué)鍍的緩沖劑，考察了鍍液參數(shù)對(duì)化學(xué)鍍的影響。 結(jié)果表明： 緩沖劑Na2CO3適合鎂合金化學(xué)鍍鎳，它不僅能提高化學(xué)鍍鎳速度， 而且可以調(diào)節(jié)鍍層與基體間的結(jié)合力， 緩沖化學(xué)鍍過程中pH值的變化； 堿性化學(xué)鍍的pH值范圍為8.5～11.5； 絡(luò)合劑檸檬酸鈉的最佳濃度為30 g/L； 所得鍍層均勻致密， 孔隙率少，屬于晶態(tài)特征明顯的低磷鍍層， 耐蝕性較好， 化學(xué)鍍層與鎂合金基體結(jié)合良好。
關(guān)鍵字: 鎂合金; 化學(xué)鍍; 緩沖劑; 耐蝕性; 結(jié)合力
NiSO4 as main salt
（ 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Faculty of Environmental and Chemical Engineering,
Shenyang Institute of Technology, Shenyang 110168, China）
Abstract: The electroless nickel-plating on magnesium alloy was studied, using NiSO4 as the main salt in the electroless plating alkaline solutions. The effects of the buffer agent and plating parameters on the properties and structures of the plating coatings on magnesium alloy were investigated in detail. The compositions of the non-fluoride and environmentally friendly plating bath were optimized through Latin orthogonal experiment. The buffer agent (Na2CO3) added to the plating bath was found to be useful in increasing the growth rate of the plating coating, adjusting the adhesion between the electroless plating coatings and the substrates, and maintaining the pH value within the range of 8.5-11.5, which is required for the successful electroless nickel-plating on magnesium alloy with NiSO4 as the main salt. Trisodium citrate dihydrate was found to be an essential component of the plating bath to plate magnesium alloy, with an optimum concentration of 30 g/L. The obtained plating coatings are crystalline, having advantages such as low-phosphorus content, high density, low-porosity, good corrosion resistance and strengthened adhesion.
Key words: magnesium alloy; electroless plating; buffers; corrosion resistance; adhesion
