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总结了用低浓度的NP氧化预处理代替经典的高浓度的AP预氧化处理的研究结果及应用。用浓度低2个数量级及1个数量级的NP(缩酸-高锰酸钾)比用高浓度的AP(氢氧化钠-高锰酸钾)进行氧化预处理,取得了更好的脱膜效果和更高的去污因子。通过预生膜试样在NP、AP试剂中释放铬的试验和测定几种材料的预生膜试样在NP试剂中腐蚀电位,从理论上解释了为什么低浓度的NP反比高浓度AP效果好的原因。试验中发现新13号合金预生膜试样在NP氧化预处理剂中不同于一般合金材料(如18-8不锈钢,Incoloy 800合金),在低酸度区,腐蚀电位随酸度升高向正方向移动的特性。
The research results and applications of the pretreatment with low concentration of NP oxidation instead of the classical high concentration AP were summarized. A better desquamation effect was achieved by the oxidative pretreatment with NP (sour-potassium permanganate) of 2 orders of magnitude and 1 order of magnitude lower than that of AP (sodium hydroxide - potassium permanganate) with high concentration And higher decontamination factor. The test of releasing chromium in NP and AP reagent by pre-membrane sample and the measurement of corrosion potential in NP reagent by the pre-membrane samples of several materials theoretically explain why low concentration of AP with high reverse-phase NP concentration is better s reason. It was found that the new No. 13 alloy pre-formed film sample is different from the common alloy material (such as 18-8 stainless steel, Incoloy 800 alloy) in the NP oxidation pretreatment agent. In the low acidity region, the corrosion potential increases with the increase of acidity to the positive direction Mobile features.