The invention relates to an
etching method for silver-
copper solder. The
etching method comprises the following steps of (1) alkaline oil removal, specifically, a brazed semi-finished product outer shell is put into an alkaline oil removal solution to be cleaned up; (2)
water washing, specifically, the brazed semi-finished product outer shell is washed by
tap water firstly and then washed by usingdeionized water; (3)
pickling, specifically, the water-washed outer shell is put into a
pickling liquid to be washed; (4)
drying, specifically, a high-temperature blast
drying box is used for high-temperature
drying the water-washed outer shell; (5)
etching, specifically, the outer shell is placed in an etching solution; and (6) final
processing, specifically, the outer shell is taken out after etching is finished, the step (2)
water washing and the step (4) drying are repeated. The etching method has the advantages that (1) the silver-
copper solder is etched without any
corrosion damage, thecoverage of outer shell
brazing appearance, size, solder and subsequent plating reliability are high; (2) the etching process is slowed down, and the etching
time range is increased; (3) environmental
pollution is relieved; (4) the etching method is low in cost, simple and easy to operate; and (5) the problem of silver displacement of
radio frequency power device outer shells is solved, and the effect is remarkable.