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                <h1>镍层性能的影响因素之镀镍表面的针孔(麻点)</h1>
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	<span style="font-family:宋体">镍层性能的影响因素之镀镍表面的针孔</span><span>(</span><span style="font-family:宋体">麻点</span><span>)</span>
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	<span style="font-family:宋体">针孔的生成是氢气泡在表面上停留的结果，而析出的氢量又随着电解液</span><span>pH</span><span style="font-family:宋体">值的减低而增大。人们多误解为针孔随着电解液</span><span>pH</span><span style="font-family:宋体">值的减少而增多，其实在</span><span>pH</span><span style="font-family:宋体">值低的电解液中可以完全防止产生针孔，而在</span><span>pH</span><span style="font-family:宋体">值高的电解液中也可能会产生针孔，观察表明</span><span>:</span><span style="font-family:宋体">在低的</span><span>pH</span><span style="font-family: 宋体">值下，生成多量氢气泡。但尺寸很小，易自阴极逸出</span><span>;</span><span style="font-family:宋体">在</span><span>pH</span><span style="font-family:宋体">值高的电解液中，虽然生成的气泡较少，但在阴极表面停留时间较长，在自阴极表面逸出之前就能产生针孔。</span>
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