摘要
Corrosion behavior of various Mg-Al-Si alloys(AS11,AS21,AS41,AS61and AS91series),cast under the same coolingconditions and controlled alloying composition,was investigated systematically.Optical microscopy and scanning electronmicroscopy were used for microstructural examinations.The corrosion behavior was evaluated by immersion tests andpotentiodynamic polarization measurements in3.5%NaCl solution.The results from both immersion tests and the potentiodynamicpolarization measurements showed that marginal improvement in corrosion resistance was observed with2.0%Al(mass fraction)containing alloy(AS21)whereas Al addition above2.0%(AS41,AS61and AS91)deteriorated the corrosion resistance which wasattributed toβphase,acting as cathode,and the interruption of continuity of the oxide film on the surface of the alloys owing tocoarsenedβand Mg2Si phases.
系统研究在相同冷却条件和成分控制条件下,不同Mg-Al-Si合金(AS11,AS21,AS41,AS61和AS91)的腐蚀行为。采用光学显微镜和扫描电子显微镜观察合金的显微组织。采用浸泡实验和动电位极化测试研究合金在3.5%NaCl溶液中的腐蚀行为。结果表明,添加2.0%Al(质量分数)的合金(AS21)抗腐蚀能力提高,而Al含量大于2.0%(AS41,AS61,AS91)时,合金的抗腐蚀能力降低。这是由于生成了β相作为阴极,以及β相和Mg_2Si相的粗化导致合金表面氧化膜的破裂后不连续。
作者
Sennur CANDAN
Ercan CANDAN
Sennur CANDAN;Ercan CANDAN(Department of Mechanical and Manufacturing Engineering, Bilecik Seyh Edebali University, Bilecik 11210, Turkey;Department of Mechanical Engineering, Avrasya University, Trabzon 61200, Turkey)
