CAJ | 학술논문

研究了 AZ31镁合金钕基转化膜的制备工艺,并对膜层形貌、化学组成和耐腐蚀性能进行了分析.通过正交优化得到了钕基转化膜的4个工艺条件的最佳水平组合为 Nd(NO 3)3浓度为5 g/L,H 2 O 2浓度为5 mL/L,成膜时间9 min,成膜温度40℃.结果表明,采用最佳工艺得到的钕基转化膜层均匀且致密,其主要成分是 Nd2 O 3和少量 MgO.通过动电位极化曲线和析氢实验研究了钕基转化膜层对 AZ31镁合金在3．5％(质量分数)NaCl 溶液中耐蚀性能的影响,结果表明,钕基转化膜可以大大降低 AZ31镁合金的腐蚀速率,当 Nd(NO 3)3浓度为5 g/L 时,钕基转化膜的腐蚀电流密度最小,耐腐蚀性能最好.
연구료 AZ31미합금녀기전화막적제비공예,병대막층형모、화학조성화내부식성능진행료분석.통과정교우화득도료녀기전화막적4개공예조건적최가수평조합위 Nd(NO 3)3농도위5 g/L,H 2 O 2농도위5 mL/L,성막시간9 min,성막온도40℃.결과표명,채용최가공예득도적녀기전화막층균균차치밀,기주요성분시 Nd2 O 3화소량 MgO.통과동전위겁화곡선화석경실험연구료녀기전화막층대 AZ31미합금재3．5％(질량분수)NaCl 용액중내식성능적영향,결과표명,녀기전화막가이대대강저 AZ31미합금적부식속솔,당 Nd(NO 3)3농도위5 g/L 시,녀기전화막적부식전류밀도최소,내부식성능최호.
The forming process,morphology composition and corrosion resistance of neodymium-based (Nd-based)conversion coating on AZ31 magnesium was investigated.The best combination of forming process se-lected by orthogonal layout was 5 g/L Nd(NO 3 )3 ,5 mL/L H 2 O 2 at 40 ℃ for 9 min.The results indicated that Nd-based conversion coating formed by the optimum process became uniform and compact,and was composed of Nd2 O 3 and MgO.The corrosion resistance of Nd-based conversion was examined by potentiodynamic polari-zation curves and hydrogen evolution test,the results showed that Nd-based conversion coating can efficiently slow down the corrosion rate of AZ31 magnesium.When Nd(NO 3 )3 was 5 g/L,Nd-based conversion coating performed the smallest corrosion current density and the best corrosion resistance.