CAJ | 학술논문

利用含新型三元复合络合剂的酸性化学镀镍液体系，在AZ91D镁合金表面通过化学镀制备Ni-P防护镀层。结果表明，镀层沉积速率随着镀液中三元复合络合剂浓度的变化而改变。利用 X 射线衍射(XRD)、扫描电子显微镜(SEM)和差热分析(DSC)对镀层结构、形貌以及热稳定性进行表征和分析。通过交流阻抗(EIS)和动电位扫描极化曲线对 Ni-P 镀层在3.5% NaCl 溶液中的耐蚀性能进行评价。镀液中三元复合络合剂的浓度对Ni-P镀层的结构与形貌有显著影响。Ni-P镀层的热稳定性随着三元复合络合剂浓度的增加而降低。当镀液中三元复合络合剂浓度为0.035 mol/L时，所制备的Ni-P镀层致密、均一，在3.5%NaCl溶液中表现出良好的耐蚀性能。
이용함신형삼원복합락합제적산성화학도얼액체계，재AZ91D미합금표면통과화학도제비Ni-P방호도층。결과표명，도층침적속솔수착도액중삼원복합락합제농도적변화이개변。이용 X 사선연사(XRD)、소묘전자현미경(SEM)화차열분석(DSC)대도층결구、형모이급열은정성진행표정화분석。통과교류조항(EIS)화동전위소묘겁화곡선대 Ni-P 도층재3.5% NaCl 용액중적내식성능진행평개。도액중삼원복합락합제적농도대Ni-P도층적결구여형모유현저영향。Ni-P도층적열은정성수착삼원복합락합제농도적증가이강저。당도액중삼원복합락합제농도위0.035 mol/L시，소제비적Ni-P도층치밀、균일，재3.5%NaCl용액중표현출량호적내식성능。
The electroless Ni-P coatings on AZ91D magnesium alloy substrate were prepared using the acidic hypophosphite-reduced electroless nickel bath containing the novel ternary ligand system. The results indicate that the deposition rate varies with the ternary ligand concentration in plating solution. The structural and morphological characteristics of the coatings were analyzed by XRD and SEM. The anticorrosion properties of the Ni-P coatings were evaluated in 3.5% NaCl solution by electrochemical impedance and potentiodynamic polarization methods. The amount of ternary ligands in electroless plating bath has an significant effect on the surface morphology and structure of Ni-P coatings. The decrease of crystallization temperature and increase of crystallization heat of all the deposits with an increase in ternary ligand concentration are found by DSC measurements. The coating obtained with 0.035 mol/L ternary ligand additive in plating bath can offer a better surface homogeneity and improve corrosion resistance.