不同水溶液對鋁與銅耦合對之伽凡尼腐蝕研究

Influence of Electrolytes on the Galvanic corrosion of Copper-Aluminum Couples

賴信成(Chin-Cheng Lai)

指導教授 ： 邱六合

大同大學/工程學院/材料工程學系所/碩士(2006年)

摘要

本文利用零電阻安培計來測量銅鋁相互耦合對在不同溫度的水溶液中之伽凡尼電流密度，並以掃瞄式電子顯微鏡觀察腐蝕後之表面型態，來釐清周遭環境引起電化學反應而產生的破壞性。結果顯示銅與鋁合金接觸產生的伽凡尼腐蝕，都是陽極的鋁合金加速被腐蝕，而銅合金受到保護，當中AA6063 -C1100耦合對在腐蝕抑制劑(F)的伽凡尼腐蝕電流密度3.4×10-7 A/cm2為最低，且加熱到70oC及流動溶液時加入腐蝕抑制劑(F)水溶液仍然有抑制伽凡尼腐蝕效果，但在加有NaCl的水溶液下，加熱到70oC會使其伽凡尼腐蝕密度大幅提升。

關鍵字

鋁銅耦合對 ； 伽凡尼腐蝕

並列摘要

The corrosion rates of metals in water cooling system were studied in this research by using electrochemical method. The copper and aluminum alloy couples were immersed in different electrolytes to simulate water cooling system environment, in addition to, the corrosion potential and corrosion current destiny was also obtained by a polarization test. Furthermore, the galvanic corrosion current of coupled copper and aluminum specimen was measured by a zero resistance ammeter, and the surface morphology of corroded specimen was observed by a scanning electron microscope to clarify the damage effect caused by the electrochemical reaction.
The results showed that the corrosion rate of aluminum sheet specimen is faster than that of copper sheet protected in the galvanic corrosion phenomena of Cu and Al sheet couple. The AA6063-C1100 couple in the corrosion inhibitor (F) had lowest galvanic corrosion current densities was 3.4×10-7 A/cm2 among this investigation. The addition of the inhibitor (F) also retarded the corrosion reaction when the electrolyte was heated to 70oC. However, the corrosion rates were greatly be increase in the sodium chloride solution.
Key words: galvanic corrosion, copper-aluminum couples

並列關鍵字

copper-aluminum couples ； galvanic corrosion

參考文獻

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