本論文探討經熱浸鍍鋁之中碳鋼於矽酸鹽類電解液系統，工作電壓為400/-100 V，工作頻率為1000Hz，工作時間20分鐘不同占空比進行微弧氧化處理所形成之氧化膜特性。我們進行微觀結構、硬度表現、相結構及耐腐蝕特性之研究，並將其氧化膜與純鋁於相同電性參數進行微弧氧化生成之氧化膜進行比較分析。
矽酸鹽類系統中，隨著占空比增加，其表面孔洞差異會越來越大，於高占空比時表面甚至會有裂紋產生，而氧化膜厚度亦隨著占空比增加而提升，但於占空比70%之氧化膜厚度又突然下降，因70%時其能量過大，造成氧化膜之裂紋與剝落。氧化膜結構主要為-Al2O3特性繞射峰，而當占空比為30%與50%時，會有Al6Si2O13相產生，因這兩組占空比之鍍層較緻密且厚度較佳，使其成相性較好;當占空比為10%與70%時，會有Al之繞射峰，因其鍍層較薄且有裂紋，才會暴露基材訊號。由實驗結果顯示，熱浸鍍鋁之中碳鋼於矽酸鹽類電解液系統於各占空比進行微弧氧化，以50%之氧化膜最佳，其擁有良好緻密性與厚度(16.93m)，且硬度值最高(406HV)，並有最高之腐蝕阻抗(3.18•104 Ω•cm2)。
將熱浸鍍鋁中碳鋼進行微弧氧化之氧化膜與純鋁進行微弧氧化之氧化膜進行比較，純鋁氧化膜於各占空比下之氧化膜皆較熱浸鍍鋁試片厚且緻密，經氧化膜元素分析發現，熱浸鍍鋁試片之氧化膜內含有鐵元素，且利用XRD分析與相圖比對，鐵元素有可能以固溶之形式存在於氧化膜當中，超過最大固溶量時會析出於氧化膜邊界，造成氧化膜與純鋁層之間有一層鐵層，使其微弧氧化最終無法繼續，鐵元素於鍍層當中不僅影響了微弧氧化的進行，也降低其硬度、耐腐蝕性與成相性。

In this study, the characteristics of the coating on the hot-dip aluminized middle carbon steel using Micro-Arc oxidation are discussed in silicate system electrolyte. The microstructures, hardness, phase structures, and corrosion resistances are discussed by adjusting duty ratio under constant frequency (1000Hz), working voltage (400V) and working time (20 minutes). Then, compared with coatings on pure aluminum in the same parameters.
With duty ratio increasing, the pores on the surface will become larger and non-homogeneous. And the thickness of the coatings also increase. But the coating of duty ratio 70% is thinner than 30% and 50%. There are some cracks on the surface on the coating of 70% . Because duty ratio 70% provide higher energy, the coating not only cracks but also flaking. The main phase structure of the coatings are -Al2O3. Al6Si2O13 phase are observed in the coatings of duty ratio 30% and 50%. From the formation of Al6Si2O13 phase revealed that dense and thick coatings could get stable phase easily. Duty ratio 10% and 70% can be observed Al substrate diffraction peak because the coatings are thinner than the other two duty ratio and there are some cracks on the surface of the coating in duty ratio 70%. The thickness of the coatings and the cracks have a great influence for the mechanical properties and corrosion behavior. Duty ratio 50% provide the highest thickness (16.93m), the optimum mechanical properties (406 HV) and the most anti-corrosive behavior (3.18•104 Ω•cm2)
Comparing the coatings of hot-dip Aluminized steel with the coatings of pure aluminum using MDO showed that pure aluminum’s coatings in every duty ratio are better the HDA steel’s coatings. From the Line scan analysis, it can be observe that the coating of HDA steel contain iron. Then, iron probably is present in the form of a solid solution of the coating by using XRD analysis and phase diagram of comparison. If the iron more than the maximum amount of
more than will be deposited on the oxide film when the maximum amount of solute boundary layer resulting in a layer of iron oxide and aluminum layer, so that the micro-arc oxidation eventually unable to continue, the iron in the coating which not only affects the micro-arc oxidation, also reduce the hardness, corrosion resistance and resistance to phase.

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