CAJ | 학술논문

为了改善316L 不锈钢在高温酸性溶液中的耐蚀性，采用化学镀技术在316L 不锈钢表面沉积高铜高磷Ni?Cu?P 镀层。采用扫描电镜(SEM)、能谱仪(EDS)和 X 射线衍射仪(XRD)对其结构进行分析，利用极化曲线、阻抗谱(EIS)及浸泡腐蚀试验对其在高温酸性溶液中的耐蚀性进行研究。结果表明，Ni?Cu?P 镀层由铜含量分别为19.98%和39.17%(质量分数)两种类型的胞状组织组成；在高温酸性溶液中，这种新型Ni?Cu?P镀层可显著改善316L不锈钢的耐蚀性；镀态镀层的耐蚀性优于热处理态的；镀态镀层和经673 K热处理镀层的腐蚀机制是选择性腐蚀，而经773和873 K热处理镀层的腐蚀机制为点腐蚀。
위료개선316L 불수강재고온산성용액중적내식성，채용화학도기술재316L 불수강표면침적고동고린Ni?Cu?P 도층。채용소묘전경(SEM)、능보의(EDS)화 X 사선연사의(XRD)대기결구진행분석，이용겁화곡선、조항보(EIS)급침포부식시험대기재고온산성용액중적내식성진행연구。결과표명，Ni?Cu?P 도층유동함량분별위19.98%화39.17%(질량분수)량충류형적포상조직조성；재고온산성용액중，저충신형Ni?Cu?P도층가현저개선316L불수강적내식성；도태도층적내식성우우열처리태적；도태도층화경673 K열처리도층적부식궤제시선택성부식，이경773화873 K열처리도층적부식궤제위점부식。
In order to improve corrosion resistance of stainless steel 316L in warm acidic solution, Ni?Cu?P coatings with high copper and phosphorus contents were deposited onto stainless steel 316L substrates via electroless plating. The structure of the film and its resistance to corrosion in a warm acidic environment were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction spectrometry (XRD), polarization curves, electrochemical impedance spectroscopy (EIS), and dipping corrosion tests, respectively. The results demonstrate that Ni?Cu?P coatings consist of two types of nodules, which are 19.98% Cu and 39.17% Cu (mass fraction) respectively. The corrosion resistance of the 316L substrate when subjected to a warm acidic solution is significantly improved by the addition of the new type of the Ni?Cu?P coating. The as-plated coatings demonstrate better corrosion resistance than annealed coatings. As-plated coatings and those annealed at 673 K are found to corrode selectively, while pitting is observed to be the main corrosion mechanism of coatings annealed at 773 and 873 K.