稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2010年
7期
1129-1134
,共6页
镁%微弧氧化%硬度%耐蚀性
鎂%微弧氧化%硬度%耐蝕性
미%미호양화%경도%내식성
magnesium%micro-arc oxidation%hardness%corrosion resistance
在氟锆酸盐、铝酸盐和硅酸盐3种不同电解液中对镁进行微弧氧化处理分别制得了锆膜、铝膜和硅膜, 对这些膜层的形貌、相组成、表面粗糙度、结合强度、硬度和耐蚀性进行了研究.结果表明:锆膜致密,由t-ZrO2、MgF2和Mg2Zr5O12相组成;铝膜多孔,由MgAl2O4和MgO相组成;硅膜多孔,由Mg2SiO4和MgO相组成.这些膜层表面很粗糙,膜层与基体结合非常牢固.铝膜的硬度比锆膜和硅膜更高.经微弧氧化处理后镁的耐蚀性得到了明显改善,其中锆膜的耐蚀性最好.
在氟鋯痠鹽、鋁痠鹽和硅痠鹽3種不同電解液中對鎂進行微弧氧化處理分彆製得瞭鋯膜、鋁膜和硅膜, 對這些膜層的形貌、相組成、錶麵粗糙度、結閤彊度、硬度和耐蝕性進行瞭研究.結果錶明:鋯膜緻密,由t-ZrO2、MgF2和Mg2Zr5O12相組成;鋁膜多孔,由MgAl2O4和MgO相組成;硅膜多孔,由Mg2SiO4和MgO相組成.這些膜層錶麵很粗糙,膜層與基體結閤非常牢固.鋁膜的硬度比鋯膜和硅膜更高.經微弧氧化處理後鎂的耐蝕性得到瞭明顯改善,其中鋯膜的耐蝕性最好.
재불고산염、려산염화규산염3충불동전해액중대미진행미호양화처리분별제득료고막、려막화규막, 대저사막층적형모、상조성、표면조조도、결합강도、경도화내식성진행료연구.결과표명:고막치밀,유t-ZrO2、MgF2화Mg2Zr5O12상조성;려막다공,유MgAl2O4화MgO상조성;규막다공,유Mg2SiO4화MgO상조성.저사막층표면흔조조,막층여기체결합비상뢰고.려막적경도비고막화규막경고.경미호양화처리후미적내식성득도료명현개선,기중고막적내식성최호.
Three micro-arc oxidization coatings were prepared on magnesium substrates in fluorozirconate electrolyte (Zr-coating), aluminate electrolyte (Al-coating) and silicate electrolyte (Si-coating). Morphologies, phase components, surface roughness, bonding strength, hardness and corrosion resistance of the coatings were investigated. The results show that the Zr-coating is dense and mainly composed of tetragonal ZrO2 (t-ZrO2), MgF2 and Mg2Zr5O12. The porous Al-coating is mainly composed of MgAl2O4 and MgO. The Si-coating is porous and mainly consists of Mg2SiO4 and MgO. The coatings formed in the three electrolytes reveal relatively coarse surface and are bonded tightly to the substrates. The Al-coating possesses a higher hardness than the Si-coating and the Zr-coating. The corrosion resistances of the coatings on magnesium surface are obviously superior to that of the pure magnesium substrate in the NaCl solution, and the Zr-coating shows the best corrosion resistance.
