通过在含Mg2+和34PO?离子的溶液中进行浸泡,在AZ31镁合金上制备磷酸镁转化膜以增强其抗腐蚀性能.经磷化处理20 min后,AZ31镁合金上的磷酸镁转化膜呈微裂纹状结构,厚度均匀(约为2.5μm).X射线能谱分析和X射线光电子谱分析表明,磷酸镁转化膜由磷酸镁和氢氧化镁或氧化镁组成.磷酸镁转化膜对AZ31镁合金可起到强烈的保护作用.磷酸镁转化膜的腐蚀电流大幅降低,约为未覆膜表面腐蚀电流的3%.在0.5 mol/L NaCl溶液中的腐蚀恶化时间由10 min延长至24 h.
Magnesium phosphate conversion coating (MPCC) was fabricated on AZ31 magnesium alloy for corrosion protection by immersion treatment in a simple MPCC solution containing Mg2+ and34PO? ions. The MPCC on AZ31 Mg alloy showed micro-cracks structure and a uniform thickness with the thickness of about 2.5 μm after 20 min of phosphating treatment. The composition analyzed by energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy revealed that the coating consisted of magnesium phosphate and magnesium hydroxide/oxide compounds. The MPCC showed a significant protective effect on AZ31 Mg alloy. The corrosion current of MPCC was reduced to about 3% of that of the uncoated surface and the time for the deterioration process during immersion in 0.5 mol/L NaCl solution improved from about 10 min to about 24 h.
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