三元合金就是含三种组成元素的合金。常用的三元合系有：Au - Ag - M； Au - Sn - M； Au - Sb - M；Au - Cu - M；等。电镀上常用 锡镍铜三元合金。
对于三元合金也作了相应的推广。
Finally, the formula has also been extended to trinary alloys.
其中以超声波电镀，真空热蒸镀及化学镀三元合金效果最佳。
The effect of tech-nologies of electroplating under ultrasonic field, heat evaporation plating in vacuum and chemical plated ternary-alloy on properties of diamond is more remarkable.
在化学镀镍-磷合金液中加入硫酸铜制得镍-铜-磷三元合金。
Electroless nickel copper phosphorus ternary alloy deposits were prepared by addition of cupric sulfate in electroless nickel phosphorus alloy plating bath.
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