不同表面處理對鎂合金(AZ31、LZ91) 鍍層皮膜性質分析

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王柏文(Po-Wen Wang) 查詢紙本館藏

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機械工程學系

論文名稱

不同表面處理對鎂合金(AZ31、LZ91) 鍍層皮膜性質分析

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摘要(中)

本研究針對商業用鎂合金AZ31與LZ91的表面腐蝕行為進行研究。透過業界進行多種表面處理，改善鎂合金AZ31與LZ91的抗腐蝕性，並進行電化學量測分析，探討其差異性。表面處理的方式有：電鍍處理、電泳處理、微弧氧化處理、烤漆處理，其中部分試片為包含兩種處理的複合型鍍層。
本研究以OM和SEM對鎂合金AZ31與LZ91及其鍍層作顯微結構觀察，並以SEM配備的EDS判別鍍層的化學組成，另外也使用XPS判別鍍層的化學組成。鑑定合金表面的結晶結構則利用XRD進行分析。合金及其鍍層的電化學性質，則將試片包覆後於室溫浸置於3.5wt% NaCl溶液中，進行動態極化曲線與電化學交流阻抗頻譜的量測。
實驗結果顯示，合金試片經電鍍後，可以有效提升腐蝕電位；經微弧氧化後，有效降低腐蝕速率，及增加腐蝕阻抗；經有機鍍層(電泳處理、烤漆處理)的試片無發生腐蝕現象。

摘要(英)

The surface corrosion behavior of AZ31 and LZ91 magnesium alloys, and those surface treatments were investigated in this study. The ways of surface treatments included electroplating(EP), electrophoresis(ED), micro-arc oxidation(MAO) and painting. Some specimens were treated by a simultaneous combination of any two ways.
Morphologies and composition of bare AZ31 and LZ91 alloys, and coated samples were examined in SEM, EDS and XPS. XRD was also performed to identify the crystal structures of alloy surface. The anticorrosion ability was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscropy (EIS) in 3.5wt% NaCl solutions.
The effect of electroplating of the alloy was improved the corrosion potential; The effect of micro-arc oxidation of the alloy was reduced the corrosion rate, and improved corrosion resistance; Then the electrophoresis and painting samples didn’t occur the corrosion.

關鍵字(中)

★ 鎂合金AZ31
★ 鎂合金LZ91
★ 電鍍
★ 微弧氧化
★ 電化學交流阻抗頻譜

關鍵字(英)

★ AZ31
★ LZ91
★ Electroplating
★ Micro arc oxidation
★ EIS

論文目次

目錄
摘要 I
Abstract II
目錄 III
圖目錄 V
表目錄 IX
第一章前言 1
第二章文獻回顧 2
2-1鎂合金簡介 2
2-1-1 鎂合金AZ31簡介 6
2-1-2 鎂合金LZ91簡介 6
2-2常用鎂合金表面處理 8
2-2-1化成處理 8
2-2-2電鍍處理 10
2-2-3微弧氧化處理 11
2-2-4有機鍍層處理 14
2-3電化學分析 17
2-3-1腐蝕電位及電流 17
第三章實驗步驟 24
3-1 實驗材料 24
3-2 實驗儀器 25
3-3 實驗步驟 26
第四章結果與討論 30
4-1 不同試片粗糙度及硬度測試 30
4-2 表面微結構 30
4-2-1 AZ31及LZ91合金試片微結構觀察 30
4-2-2介在物顆粒數目與尺寸量測 33
4-2-3鍍層微結構/橫截面觀察及分析 35
4-4 不同試片腐蝕行為觀察 44
4-5 腐蝕電位及電流分析 45
4-6電化學交流阻抗頻譜分析 49
4-6-1 LZ91合金的氧化物和氯化物反應 49
4-6-2 AZ31合金的氧化物和氯化物反應 51
4-6-3 AZ31及LZ91合金試片的交流阻抗頻譜分析 52
4-6-4 AZ31及LZ91 EP試片的交流阻抗頻譜分析 56
4-6-5 AZ31及LZ91 MAO試片的交流阻抗頻譜分析 58
4-6-6 AZ31及LZ91 有機鍍層試片的交流阻抗頻譜分析 60
4-7 X-ray繞射分析 62
第五章綜論 63
5-1 鎂合金AZ31和LZ91的腐蝕行為 63
5-2 鎂合金AZ31和LZ91及其鍍層的動態極化曲線表現 63
5-3 鎂合金AZ31和LZ91及其鍍層的交流阻抗頻譜分析表現 63
第六章結論 65
參考文獻 66
附錄一電化學交流阻抗頻譜擬合曲線 71
附錄二 AZ31再進行熱處理之實驗觀察 75
附錄三電化學實驗注意事項 80

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指導教授

施登士(Teng-Shih Shih)

審核日期

2016-8-3

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