臺灣博碩士論文加值系統

本研究使用定電位法，以波特蘭I型水泥粉末(代號C)作為基底混參脫硫渣改質物(代號M)與SiO2(代號S)粉末製備鹼性電解液，於AZ91D表面成長鈍化膜，以提升其抗腐蝕性能。極化試驗結果顯示，AZ91D表面在C+12S與C+12S+30M鹼性水溶液中其陽極曲線皆有鈍化的現象產生，鈍化區間隨C+12S與C+12S+30M添加量的增加而減少，而硫酸根離子隨著C+12S與C+12S+30M添加量的增加而增加，導致鈍化膜被破壞。當定電位試驗之電位為-1.25V，試驗溫度為室溫，鎂合金表面成長一淡金色的鈍化膜。將鈍化膜進行極化試驗，試驗結果顯示鈍化膜的腐蝕電流密度由115 mAcm-2(AZ91D)降至8.836 mAcm-2。將定電位試驗溫度由室溫提高至50°C，鈍化膜的腐蝕電流密度由8.836 mAcm-2降至4.673 mAcm-2，顯示溫度有助於成長鈍化膜。此外，鈍化膜成長於不同表面粗糙度的基材會影響鈍化膜的抗腐蝕性能。經穿透式電子顯微鏡觀察鈍化膜厚度約為50 nm。經接觸角分析，基材的接觸角為25°，鈍化膜的接觸角為64°，顯示鈍化膜對於基材來說疏水性相對較高。經鹽霧試驗，鈍化膜抵抗鹽霧試驗的時間可長達48小時才開始有大面積腐蝕斑點產生。綜合以上研究顯示，鈍化膜可以保留鎂合金金屬原色，並具有表面改質的能力，同時提升AZ91D鎂合金表面的抗腐蝕能力。

Passivation film on surface of AZ91D Mg alloy is prepared by electrochemical method, using Ordinary Portland cement (code C) containing modified desulfurization slag (code M) and SiO2 (code S). The results of polarization test show that there is a passivation phenomena for AZ91D in C+12S and C+12S+30M alkaline aqueous solution. The passivation interval decrease with increasing of C+12S and C+12S+30M contents. Amount of sulphate ion increase with increasing of C+12S and C+12S+30M contents, which leads to the destruction of the passivation film. There is a golden passivation film formed on the surface of AZ91D after potentiostatic polarization test at room temperature. The results of polarization test show that the corrosion density of the passivation film drop from 115 mAcm-2(AZ91D) to 8.836 mAcm-2. After raising the temperature of potentiostatic polarization test from room temperature to 50°C, the corrosion density of passivation film drop from 8.836 mAcm-2 to 4.673 mAcm-2, which indicate that the temperature aiding the growth of passivation film. In addition, by changed the surface roughness of substrate before forming the passivation film affect the surface corrosion resistance. The thickness of passivation film is about 50 nm obtained by transmission electron microscope. Contact angle analysis show that the contact angle of passivation film is 64°, which is relative hydrophobic compared to substrate (25°). Salt spray test show that the anti-salt spray time of passivation film is improved to 48 hour. The studies show that passivation film retains the primary color of magnesium alloy and has the ability to modify the surface of AZ91D, while enhancing the surface corrosion resistance.

摘要 i
ABSTRACT ii
第一章 前言 1
第二章 實驗步驟與方法 5
2-1 鎂合金試片 5
2-2 水泥混和物粉末製備 5
2-3 脫硫渣改質物製備 5
2-5 結構及成份分析 6
2-6 電化學定電位試驗 6
2-7 電化學極化試驗 7
2-8 離子層析試驗 8
2-9 鹽霧試驗 8
2-10 表面接觸角分析 8
第二章 結果與討論 9
3-1 C+12S / C+12S+30M粉末結構特性分析 9
3-2 AZ91D表面於C+12S / C+12S+30M鹼性電解液中鈍化性質之研究 9
3-3 AZ91D表面於C+12S / C+12S+30M鹼性電解液中成長鈍化膜之研究 10
3-4 AZ91D表面於C+12S / C+12S+30M鹼性電解液中成長鈍化膜其抗腐蝕特性之研究 11
第四章 結論 14
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