在酸性溶液中对经一种Mannich碱处理的Cu粉进行了腐蚀实验. 热分析结果表明, 原始Cu粉在200℃开始氧化, 而经处理的Cu粉从300℃开始氧化. X射线光电子能谱分析表明, 该Mannich碱与Cu2+形成配位化合物吸附在Cu粉表面, 形成Cu/缓蚀膜结构, 通过覆盖效应抑制了腐蚀. 设计实验分离出该Mannich碱与Cu粉的直接反应产物, 并制备了Mannich碱与Cu2+的配合物. 配合物的红外光谱和紫外可见光谱表明, 该Mannich碱是通过分子中的N原子与Cu2+形成配合物而实现保护作用, 分子中的O原子未参与配位.
Oxidation resistance of copper particles modified with one king of mannich base was studied. Anti-corrosion properties were tested by etching copper particles in acid medium, and the results showed that the corrosion of copper particles was effectively inhabited by modification with the mannich base. On the basis of TG-DTA thermal analysis, we found the original copper particles were oxidized at 200 degrees centigrade, while the treated copper particles were oxidized at 300 degrees, 100 degrees higher than the original ones. XPS analysis showed the mannich base improved the oxidation resistance of copper particles by coordinating with Cu2+ to form protective film on the surface of copper particles. To discover the reaction between the manncih base and copper particles, we tried to obtain the reaction product of the mannich base and copper particles, and furthmore prepared the complex of the manncih base and Cu2+. IR and UV-vis spectrum of the complexes showed that the N atom in the manncih base molecular, instead of O atom was the coordinating atom bonded to Cu2+.
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