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本文重点研究了纯水中微量铜、氯离子对铝的点腐蚀的影响,以及γ辐射对点腐蚀的作用. 试验表明,铜、氯离子浓度在<0.05毫克/升时,АО铝、АД1铝和铝合金可完全避免点腐蚀的发生.对于АД1铝和铝合金,单一氯离子浓度在0.1—0.2毫克/升时,亦不会产生点腐蚀. 在低浓度的铜、氯离子介质中(浓度<1毫克/升),γ辐射可以促使点腐蚀转化为均匀腐蚀,但其腐蚀量却大大增加. 试验还证明,铝经过阳极氧化后,可以有效地防止点腐蚀发生,而且均匀腐蚀量也大为减少. 本文还叙述了铁、铅、镍和硝酸根等离子对铝的点腐蚀影响,以及重铬酸钾在铜、氯离子溶液中对铅的缓蚀作用.
This paper focuses on the impact of trace copper and chloride ions in pure water on the pitting corrosion of aluminum and the effect of γ radiation on pitting corrosion.The results show that when copper and chloride ion concentration is less than 0.05 mg / And aluminum alloy can completely avoid the occurrence of pitting corrosion.For АД1 aluminum and aluminum alloy, single chloride ion concentration of 0.1-0.2 mg / l, will not produce pitting corrosion.In low concentrations of copper, chloride medium (concentration <1 mg / L), γ radiation can promote the point corrosion into uniform corrosion, but its corrosion is greatly increased.Experiments also show that aluminum anodizing can effectively prevent the occurrence of pitting corrosion, and the amount of uniform corrosion is also large In order to reduce, this paper also describes the influence of iron, lead, nickel and nitrate ions on the corrosion of aluminum and the corrosion inhibition effect of potassium dichromate on copper and chloride ions.