CAJ | 학술논문

以硫酸镍及四氯化锡为主盐，以次磷酸钠为还原剂，运用化学镀技术在碳钢 L245上沉积 Ni-Sn-P镀层.根据 Sn 含量不同，将试样分为6组.采用能谱分析仪及扫描电镜检测镀层特定元素的含量及表面结构形态；根据极化曲线及交流阻抗谱分析镀层耐蚀性.结果表明，化学沉积中 Sn 元素的加入明显降低镀层的孔隙率，提高镀层的耐蚀性；Sn 含量在7．05％(质量分数)的镀层的孔隙率最低，耐蚀性最好.
이류산얼급사록화석위주염，이차린산납위환원제，운용화학도기술재탄강 L245상침적 Ni-Sn-P도층.근거 Sn 함량불동，장시양분위6조.채용능보분석의급소묘전경검측도층특정원소적함량급표면결구형태；근거겁화곡선급교류조항보분석도층내식성.결과표명，화학침적중 Sn 원소적가입명현강저도층적공극솔，제고도층적내식성；Sn 함량재7．05％(질량분수)적도층적공극솔최저，내식성최호.
Electroless Ni-Sn-P coatings were deposited on mild steel L245 substrates in an alkaline-citrate-based bath where nickel sulphate and stannic chloride were used as metal ion sources and sodium hypophosphite was used as a reducing agent.Six groups of coatings were prepared based on the content of stannum.The element concentration and surface morphology of the coatings were examined by energy dispersive spectrometer (EDS) and scanning electron microscopy (SEM).The corrosion resistance were examined by polarization curve and AC impedance spectroscopy.Results indicated that stannum can reduce the porosity of coating and improve the cor-rosion resistance.The coating with stannum 7.05wt% had the minimum porosity and the highest corrosion re-sistance.