臺灣博碩士論文加值系統

在沖磨腐蝕環境中，沖蝕與腐蝕交互影響會加劇材料損耗，兩作用間的協同效應複雜且多變，並因沖蝕加速腐蝕、腐蝕加速沖蝕或腐蝕減緩沖蝕等方式衍生出不同的主控機制，本研究以麻田散鐵型不銹鋼SUS420 J2經不同pH值(pH2、pH3)所構成的腐蝕環境與不同沖磨角度(30°、60°、90°)、不同沖磨轉速(600rpm、800rpm、1000rpm)之沖磨腐蝕試驗後，探討沖磨腐蝕主控機制和沖磨腐蝕率與沖磨表面型態間的關聯。
研究結果顯示，純腐蝕試驗中(腐蝕溶液為動態，轉速600rpm、800rpm、1000rpm)，pH2環境之各轉速試片的腐蝕表面都是在腐蝕生成物層上沿著晶粒邊界散佈著不規則的孔穴，相較於pH2，pH3環境的試片則因為酸性強度不同，腐蝕行為也不同，孔穴的位置是隨機分佈在基底上，並且隨轉速變化，孔穴數量也不一。最大腐蝕率發生在pH2，800rpm試驗參數上。在pH2的沖磨腐蝕試驗中，由於酸性較強，材料表面腐蝕生成物層形成速度較快也較厚，其與基底之黏結力較弱，使沖蝕較能有效推離移除腐蝕生成物層，沖磨腐蝕主控模式在中高沖磨角度以腐蝕-沖蝕與沖蝕-腐蝕控制為主，且腐蝕與沖蝕間呈現相互加速的協同效應，故有著較高的沖磨腐蝕率，在低沖磨角度則為腐蝕主控機制和加值效應，沖磨腐蝕率相對較低。當酸性減弱至pH3時，腐蝕速度減緩，腐蝕生成物層較薄且與基底的結合力也較強，導致沖蝕不易移除腐蝕生成物，沖磨腐蝕主控模式以腐蝕控制為主，沖磨腐蝕率較低。最大沖磨腐蝕率產生在pH2，60°，800rpm的試驗參數上。

In erosive and corrosive environment the damages mechanisms are complex and generally the measured material losses are higher than the sum of separate mass losses due the corrosion and erosion. The control modes of material loss are depended on the erosion-corrosion synergistic effects which are sensitive to material and test conditions such as pH value, impact angle and impact velocity. The aim of this work was to study the effect of impact angle (30, 60, 90) and impact velocity (600rpm, 800rpm, 1000rpm) on the erosion-corrosion resistance of SUS420 J2 stainless steel in different sulfuric acid slurry (pH2, pH3). The findings related to the worn surfaces, material loss rate and erosion-corrosion behavior were evaluated and discussed.
The results had shown that in pure corrosion the corrosion products and irregular corrosion pits were formed on the surface of the specimens. And in pH2 condition these pits were located on the grain boundaries while in pH3 condition pits were dispersed on the matrix. The amount and the size of pits are varied with impact velocity. The test condition for maximum corrosion rate was pH2 and 800rpm. The erosion-corrosion tests in pH2 slurry a thick corrosion product film was covered on the surface of specimens. This thick film leaded a greater erosion-corrosion rate because the bonding force was weak between corrosion product film and matrix. For medium and normal incident, the control modes of material loss were erosion-corrosion or corrosion-erosion and the synergism was positive, while a corrosion control mode and additive effect were found for low impact angle. In pH3 slurry the corrosion product film was thin and the adhesion was strong, hence the erosion-corrosion rate was decreased. The control mode of material loss was corrosion domination. In all tests the maximum erosion-corrosion rate was found on the parameters of pH2, 60 and 800rpm.

誌謝 I
摘要 II
Abstract IV
目錄 VI
表目錄 IX
圖目錄 X
第一章 前言 1
第二章 文獻回顧 3
2.1不銹鋼簡介 3
2.1.1不銹鋼的分類 3
2.2 麻田散鐵系不銹鋼特性 6
2.2.1 麻田散鐵型不銹鋼SUS420 J2之用途 8
2.3 腐蝕 8
2.3.1 金屬的腐蝕型態 9
2.4 沖蝕 10
2.4.1影響沖蝕磨耗的主要因素 12
2.5 沖磨腐蝕 13
2.5.1 沖磨腐蝕型態 13
2.5.2 沖磨腐蝕率 15
2.5.3 沖磨腐蝕各效應間之關係 16
第三章 實驗方法 18
3.1 實驗材料 18
3.2 實驗設備 18
3.2.1 沖磨腐蝕試驗系統 18
3.3 沖磨腐蝕試驗參數 20
3.3.1 實驗條件設定 20
3.3.2 沖磨腐蝕試驗 22
3.4 實驗分析 22
3.4.1 沖磨腐蝕機制觀察 22
3.4.2 純腐蝕率與沖蝕影響下的腐蝕率計算 23
第四章 結果與討論 24
4.1 金相組織 24
4.2 材料損失 25
4.2.1 純沖蝕 25
4.2.2 純腐蝕 27
4.2.3 在沖蝕影響下的腐蝕 33
4.2.4 沖磨腐蝕 40
4.3 沖磨腐蝕率 44
4.3.1 沖磨轉速與沖磨角度的影響 44
4.3.2 pH值的影響 46
4.4 沖磨腐蝕地圖 46
4.4.1 沖磨腐蝕主控機制圖 46
4.4.2 加值-協同效應圖 50
4.5 綜合討論 52
第五章 結論 60
參考文獻 62
作者簡介 68

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