Pb、Cu元素對熱壓燒結Al-Si合金磨耗腐蝕行為之影響; Effect of Alloying Elements on the Wear-Corrosion Behavior of Al-Si Alloys

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/2006

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Title:	Pb、Cu元素對熱壓燒結Al-Si合金磨耗腐蝕行為之影響;Effect of Alloying Elements on the Wear-Corrosion Behavior of Al-Si Alloys
Authors:	高正華;Z-H Gao
Contributors:	機械工程研究所
Keywords:	磨耗腐蝕;鋁;鉛;wear;corrosion;Al;Pb
Date:	2001-06-15
Issue Date:	2009-09-21 11:36:13 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	以熱壓燒結製程製作含不同Pb(0-10 wt %)、Cu (3 wt%)之Al-Si (20 wt%)複合材料，並施以熱處理後，利用微結構分析、硬度與緻密度量測、磨耗、腐蝕、與磨耗腐蝕試驗，來評估Pb、Cu元素對Al-20Si合金在3.5wt%氯化鈉(NaCl)水溶液中(pH=6.7)磨耗腐蝕行為之影響。結果顯示經熱壓製成之Al-Si-Pb-Cu複合材料，其緻密度約為理論密度的99%。添加Cu於Al-Si與Al-Si-Pb合金中可提升其硬度，其中Al-Si-Pb-Cu合金之硬度提升比例隨Pb含量增加而上升。於乾磨耗試驗中，合金磨耗量隨著Pb含量的增加而降低，而添加Cu於Al-Si合金中可強化基地，進一步提升其抗磨耗性質。而於腐蝕實驗中，添加Pb、Cu元素均會使合金之腐蝕電流上升，然而，當合金經熱處理後，除了Al-Si合金腐蝕電流升高外，其餘合金之腐蝕電流皆下降，並且腐蝕電位也顯得較為鈍性。此外，添加Pb則可促進合金的鈍化。 Al-Si-Pb合金之熱處理溫度顯著影響其腐蝕性質，當熱處理溫度(300℃)低於Pb熔點時，會使Pb的析出相粗大，導致腐蝕電流急劇升高，而當熱處理溫度(370℃)高於Pb熔點時，則Pb的析出相明顯細化並增加其抗蝕性。Al-Si合金具有優良之磨耗腐蝕性質，磨耗量隨外加電位往陽極增加而降低，而添加Pb和Cu皆可提升Al-Si合金之耐磨耗腐蝕性質，並且含Pb合金，由於具有良好的鈍化行為，當外加電位達鈍化區時，腐蝕電流與磨耗量皆明顯下降。 The synergistic wear-corrosion behavior of Al-20Si-XPb-YCu (X=0-10 wt %,Y=0-3 wt %) alloys fabricated by a hot pressing technique and further heat-treated was evaluated on a block-on-ring tribotest in 3.5 wt% sodium chloride (NaCl) aqueous solution. (pH 6.8) The studies involved the effects of applied potential and environments (dry air and 3.5% NaCl solution ) on the wear rate of alloys. Corrosion behavior was determined by potentiodynamic polarization tests. The results showed that the addition of both lead and copper improved the wear resistance but had a higher corrosion rate. However, heat treatment had a beneficial effect on the corrosion resistance of all alloys, and the lead content improved their passivity. In addition, the heat treatment temperature of Al-Si-Pb alloys had a significant effect on its corrosion resistance. When treating temperature (300ْC) was below lead melting point, the lead phase precipitated larger, and corrosion rate increased sharply. On the contrary, as treating temperature (370ْC) was above lead melting point, had the beneficial effect on both lead precipitate and corrosion resistance. Al-Si alloy had excellent wear corrosion resistance, the wear loss decreased with increasing applied potential anodically. Furthermore, the addition of both lead and copper improved wear corrosion resistance. Also, the passivity in containing lead Al-Si alloys improved significantly, which was responsible for both wear rate and corrosion current decreasing obviously in the passive potential region during the wear-corrosion test.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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