周期换向（periodic reversal）指的是在进行电解法处理废水时（在某些情况下）要求电流方向作周期性变化的行为。
目前除采用一般的直流电外，根据实际的需要还可采用周期换向电流及脉冲电流。
At present in the general of dc outside, according to the actual need to still can use cycle reversing current and pulse current.
本文考察和研究了脉冲电镀及周期换向电镀法中各项脉冲参数对钯-镍合金的镀层成份、电流效率的影响。
The effects of pulse and periodic current parameters on the composition of Pd -ni alloy deposit and on the current efficiency of the electrodeposition process have been studied.
由于负向电流可以腐蚀削减铸层表面微观突起的生长高度，因此周期换向脉冲电流微电铸与单向正脉冲电流微电铸相比更易获得较好的铸层均匀性。
Because the height of micro tips on cathode surface can be eroded by the negative current, surface finishing is better in the micro-electroforming by periodic reverse pulse current than pulse current.
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