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渗氮后零件可以发黑吗? |
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点评
硝酸钠?常温发黑? 酸洗是用亚硝酸钠。
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小黑屋|手机版|Archiver|机械社区 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
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