不同製程參數對AA1050與AA5052陽極皮膜抗腐蝕能力的影響; Influence of corrosion resistance of different processing parameters of AA1050 and AA5052 anodic films

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/43570

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/43570

Title:	不同製程參數對AA1050與AA5052陽極皮膜抗腐蝕能力的影響;Influence of corrosion resistance of different processing parameters of AA1050 and AA5052 anodic films
Authors:	陳正義;Cheng-Yi Chen
Contributors:	機械工程研究所
Keywords:	鹽霧試驗;陽極處理;電化拋處理;抗腐蝕能力;anodic treatment;electro-polishing;corrosion resistance;salt spray
Date:	2010-07-28
Issue Date:	2010-12-08 13:45:16 (UTC+8)
Publisher:	國立中央大學
Abstract:	鋁中添加鎂元素可提高鋁合金機械性質，但也帶來了較多的介在物，因而降低抗腐蝕能力。本實驗中將AA1050H16 與AA5052H32 兩種材料施以不同陽極條件與封孔方式。封孔方式分別以熱水與醋酸鎳溶液進行封孔處理。電化拋處理亦為參數之一，其目的是用來比較電化拋對陽極皮膜品質與抗腐蝕能力的影響。經由鹽霧試驗發現， AA5052H32 陽極皮膜的抗腐蝕能力比AA1050H16 的低，主要是由於(1)陽極皮膜裡含有MgO 與(2)基材內部有較多的介在物顆粒的影響。陽極皮膜經由醋酸鎳溶液封孔後，皮膜內會有Ni(OH)2 的形成，故其抗腐蝕能力會高於使用熱水封孔。電化拋處理可顯著改善表面粗造度與提高陽極孔洞的排列規律，但試片表面的殘留層在陽極過程中會形成鋁氯化合物，因而降低陽極皮膜的抗腐蝕能力。經鹽霧試驗後，使用熱水封孔的陽極試片（ AA1050H16）其色差值會比使用醋酸鎳封孔的高。相反地，當陽極試片（ AA5052H32）使用熱水封孔時，其色差值會比較低。 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.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	1182	View/Open

社群 sharing

Loading...