下(部电)接头
The semi-bright Ag-RE ( silver-rare earth) composite deposits have the properties of higher hardness and wear resistance, greater adhesive strength, higher tarnish resistance, as well as lower porosity and lower contact resistance than pure silver plating layers.
这种银&稀土(Ag-RE)复合镀层比镀银层硬度高、耐磨,结合力和抗变色性能强,而且孔隙率和接触电阻都较低。
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