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dc.contributorJun-Yen Uanen_US
dc.contributor.authorJun-Hong Wangen_US
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dc.description.abstractIn this study, CaCO3/Ca3(SiO4)O slurry containing different weight ratio of SiO2 and modified desulfurization slag, sprayed coating on AZ91D for improving the corrosion performance and the heat resistance of the alloy. The result of experiment show the corrosion performance of the spray-coated AZ91D is improved with increasing SiO2 content added into cement slurry. When the spray coating containing >12 wt.% SiO2, the corrosion performance of the spray-coated AZ91D is not enhanced and C-S-H (CaO-SiO2-H2O) gel is hindered self-repair. In addition, when 30 wt.% modified desulfurization slag added into containing 12 wt.%SiO2 cement slurry spray coating on AZ91D (C+12S+30M@AZ91D), the corrosion current density of the spray-coated AZ91D was decreased from 198 μAcm-2 (AZ91D) to 14.61 μAcm-2. The anti-salt spray time of C+12S+30M@AZ91D is improved to 144 hour. The corrosion resistance ability has elevated the phenomenon. After 48 hour of salt spray test, the C+12S+30M@AZ91D surface can be found the forming of CaO-CaCO3 dense layer. In heat resistance properties, the C+12S+30M@AZ91D surface on the coatedside was heated to 500 ℃, the tensile strength of C+12S+30M@AZ91D can be maintained at 204 MPa. The ignition temperature of C+12S+30M@AZ91D is increased from 580 ℃ (AZ91D) to 650 ℃. The time to onset burning at 735 ℃ of C+12S+30M@AZ91D can be increased from 45 second (AZ91D) to 89 second. The spray-coated AZ91D, the coating materials containing the 12 wt.% SiO2 cement slurry added with 30 wt.% modified desulfurization slag, can improve the corrosion performance and the heat resistance of AZ91D. After spray-coated on AZ91D, the density rising of the spray-coated AZ91D was maintained at <5 %.en_US
dc.description.abstract本研究將富含不同重量比例SiO2與脫硫渣改質物之CaCO3/Ca3(SiO4)O之漿料噴覆於鎂合金AZ91D表面,以提升其抗腐蝕能力與耐熱性質。實驗結果顯示,隨著噴覆層中添加SiO2的比例增加,其抗腐蝕能力有提升的趨勢。其中,當噴覆層中添加>12 wt.%SiO2時,抗腐蝕能力方面並無再隨著SiO2添加比例增加有再提升的現象,並同時有阻礙C-S-H膠體(Ca3(SiO4)O水合反應)進行自我修復。另外,在含有12 wt.%SiO2水泥漿料中添加30 wt.%脫硫渣改質物,其噴覆於AZ91D表面之試片的腐蝕電流密度可從198 μAcm-2 (AZ91D)降至14.61 μAcm-2。其試片抵抗鹽霧試驗時間相較於其他參數試片可提升至144小時,抗腐蝕能力方面隨著脫硫渣改質物添加有再提升的現象。此外,可發現其經過48小時鹽霧試驗,試片表面會形成一層CaO-CaCO3緻密層可阻礙氯離子進行腐蝕。耐熱性質方面,其試片噴覆層表面加熱至500 ℃之破斷應力可從91 MPa (AZ91D)提升至204 MPa,有助於鎂合金於高溫環境下仍能維持強度。燃點溫度方面,其試片可從580 ℃ (AZ91D)增加至650 ℃。在735 ℃環境下耐燃時間可從45秒(AZ91D)增加至89秒,大幅提升AZ91D的耐熱性質。AZ91D表面噴覆含有30 wt.%脫硫渣改質物之防蝕隔熱噴覆層,有助於提升AZ91D鎂合金的抗腐蝕能力與耐熱性質。此外,AZ91D表面噴覆防蝕隔熱噴覆層之試片密度增加幅度仍在5 %以內,使AZ91D仍保有輕量化之優勢。zh_TW
dc.description.tableofcontents摘要 I ABSTRACT II 表目錄 V 圖目錄 VI 第一章 前言 1 第二章 實驗步驟與方法 6 2-1 鎂合金試片 6 2-2 噴塗防蝕隔熱漿料製備 6 2-3 脫硫渣改質物製備 7 2-4 氣動式噴槍 噴塗程序 7 2-5 結構及成份分析 7 2-6 電化學極化試驗 8 2-7 鹽霧試驗 8 2-8百格測試 8 2-9 密度量測 9 2-10高溫強度測試 9 2-11燃點測試 10 2-12阻燃測試 10 2-13熱分析試驗 10 第三章 結果與討論 11 3-1 添加不同SiO2比例之防蝕隔熱噴覆層 11 3-1-1 防蝕隔熱噴覆層結構特性分析 11 3-1-2 防蝕隔熱噴覆層抗腐蝕特性研究 11 3-1-3 防蝕隔熱噴覆層之密度研究 14 3-1-4 AZ91D表面噴覆防蝕隔熱漿料之高溫強度試驗 14 3-2添加不同含量脫硫渣改質物於含有12 wt.%SiO2之防蝕隔熱噴覆層 15 3-2-1 脫硫渣改質物與含有脫硫渣改質物之防蝕隔熱噴覆層結構特性 15 3-2-2 含有脫硫渣改質物之防蝕隔熱噴覆層抗腐蝕特性研究 15 3-2-3 含有脫硫渣改質物之防蝕隔熱噴覆層與AZ91D間貼附性研究 18 3-2-4 含有脫硫渣改質物之防蝕隔熱噴覆層之密度研究 19 3-2-5 AZ91D表面噴覆含有脫硫渣改質物防蝕隔熱漿料之高溫強度試驗 19 3-2-6 AZ91D表面噴覆含有脫硫渣改質物防蝕隔熱漿料之燃點/阻燃試驗 20 第四章 結論 22 參考文獻 79zh_TW
dc.subjectAZ91D magnesium alloyen_US
dc.subjectdesulfurization slagen_US
dc.subjectheat resistanceen_US
dc.subjectair sprayen_US
dc.titleSpray coating of CaCO3/Ca3(SiO4)O slurry containing SiO2/modified desulfurization slag on AZ91D Mg alloy for improving the corrosion performance and the heat resistance of the alloyen_US
dc.typeThesis and Dissertationen_US
item.fulltextwith fulltext-
item.openairetypeThesis and Dissertation-
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