Influence of corrosion resistance of different processing parameters of AA1050 and AA5052 anodic films
碩士 === 國立中央大學 === 機械工程研究所 === 98 === Magnesium added in aluminum can increase the strength of aluminum alloy. But it also brings about inclusions in the matrix of aluminum alloy to decrease the corrosion resistance. This study used the materials of AA1050H16 and AA5052H32 as base metals to carry out...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/26525062232601659570 |
| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 98 === Magnesium added in aluminum can increase the strength of
aluminum alloy. But it also brings about inclusions in the matrix of aluminum alloy to decrease the corrosion resistance. This study used the materials of AA1050H16 and AA5052H32 as base metals to carry out anodization with different anodizing conditions and sealing processes.
Pre-treatment of electro-chemical polish (ECP) is also concerned and treated as variable to compare its effect on the amorphous anodization film (AAO) quality and corrosion resistance.
After salt water spraying test, we found that AAO film formed on AA5052H32 surface has a lower corrosion resistance than AA1050H16 that mainly affected by (1) forming MgO in AAO film and (2) high amount of inclusion particle existed in matrix. Experimental results also
point out that sealing AAO film by using nickel acetate can improve sample’s corrosion resistance due to the existence of nickel hydroxide on AAO film. Pre-treatment of ECP process smoothed the sample’surface and improved the regularity of anodized pore arrangement. The residues on surface tended to interact with oxygen to form complex products during anodization deteriorating the AAO film’s corrosion resistance.
Anodized samples (AA1050H16) sealed by hot water show a higher color difference than those sealed by nickel acetate solution. Contrarily, anodized samples (AA5052H32) show less degree of color difference after hot water sealing was used.
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