(上海交通大學(xué) 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室, 上海 200030)
摘 要: 采用質(zhì)量法、 X射線能譜法（EDX）及穩(wěn)定常數(shù)法分別測量了鎂合金直接化學(xué)鍍的沉積速度、 鍍層磷含量, 以及鍍液穩(wěn)定性隨鍍液使用周期的變化。 結(jié)果表明： 在鎂合金化學(xué)鍍工藝中， 隨著使用周期的增加， 鍍速和鍍液的穩(wěn)定常數(shù)明顯下降，鍍層中磷含量緩慢增加； 鍍液使用超過3周期后， 由于Na+與F-離子的積累， 會產(chǎn)生NaF與NiF2沉淀， 沉淀的產(chǎn)生對化學(xué)鍍過程會產(chǎn)生非常不利的影響。
關(guān)鍵字: 鎂合金; 化學(xué)鍍鎳; 老化
magnesium alloys
（State Key Lab of Metal Matrix Composite,
Shanghai Jiaotong University, Shanghai 200030, China）
Abstract:Using mass measurement, EDX and stability constant measurement, the variations of deposition rate, phosphorous content and stability of electroless bath during the ageing of electroless nickel bath system were studied. The results show that the ageing of bath causes a dramatic declining of deposition rate and bath stability, while a slow increasing of phosphorous content of deposit. Particles of NaF and NiF2 can precipitate from the bath due to the accumulation of sodium and fluorine ions when the addition of nickel is beyond 3 metal turnovers (MTO). The precipitate has a detrimental effect on EN process.
Key words: magnesium alloys; electroless nickel plating; ageing
