| 摘要: | 本研究之主旨在研究冷鏈技術中蓄冷劑對鋁蓄冷容器之腐蝕與防蝕。15 wt% 氯化鈉水溶液為常用之蓄冷劑，鋁箔(厚度7 μm)因屬於價廉且具有良好熱傳之材料，常作為蓄冷袋容器。由於氯鹽類溶液對鋁金屬腐蝕性極為強烈，一旦鋁蓄冷袋遭受腐蝕之破壞，將造成蓄冷失效及系統污染之災情與經濟損失。為防止此腐蝕現象發生，必須對蓄冷系統進行防腐蝕處理。本案之防蝕策略採用腐蝕抑制劑防腐蝕法，將蓄冷容器中取出之純鋁箔試片，分別浸泡在單純之-30、-20、0、20、40和60 °C 15 wt% 氯化鈉溶液蓄冷劑中，與添加10-6M 、10-5M、10-4M、10-3M濃度之1,2,3-苯駢三氮唑(benzotriazole BZ)、色胺酸(tryptophan, TR) 、香草精(vanillin, VL)三種綠色腐蝕抑制劑之蓄冷劑於溶液中進行腐蝕測試，試片於浸泡3、5、7、14 和21天後，取出試片，接下來將試片表面除去表面腐蝕生成物後，可以求出重量損失，計算出其抑制劑BZ+TR之抑制效率為最好(97.20%)，再以電化學加速實驗測進行再次驗證，首先測試開路電位量測其腐蝕電位，線性極化量、交流阻抗、塔弗極化法測得到BZ+TR其腐蝕抑制效率在電化學之抑制效率分析中為系統中最好之抑制劑(圖5- 1)，而與等效電路得到其腐蝕抑制方式，陽極動態循環極化法得到腐蝕抑制劑對孔蝕之敏感程度，其中添加BZ+TR之孔蝕電位相較其他抑制劑來的高，在以熱力學吸附理論得出其抑制劑吸附方式，其討論之抑制劑均為混合性吸附(物理性吸附+化學性吸附)，以X射線光電子能譜的分析進一步確認其鍵結方式，由N 1s中Al-N這個鍵結確認抑制劑與試片進行化學性吸附。;Theain purpose of this research is to study the corrosion and anti-corrosion of the cold storage agent to the aluminum cold storage container in the cold chain technology. 15 wt% sodium chloride solution is a common cold storage agent, and aluminum foil (thickness 7μm) is often used as a cold storage bag container because it is a cheap and good heat transferaterial. Because the chloride salt solution is extremely corrosive to aluminumetal, once the aluminum cold storage bag is damaged by corrosion, it will cause cold storage failure and system pollution disasters and economic losses. In order to prevent this corrosion phenomenon, the cold storage systemust be protected from corrosion. The anti-corrosion strategy in this case adopts the anti-corrosionethod of corrosion inhibitor. The aluminum foil test pieces are immersed in pure-30、 -20, 0, 20, 40 and 60 °C 15 wt% sodium chloride solution cooling agent respectively, and 10-6M, 10-5M, 10-3M concentration of benzotriazole (BZ); tryptophan (TR); vanillin (VL) three kinds of green corrosion inhibitor cold storage agent for corrosion test, the test piece is soaked for 3, 5, 7, 14 and 21 days, take out the test piece, remove the surface After the corrosion product, the weight loss can be calculated, and the pitting depth of the surface can be observed, and theneasured by the open circuit potentialeasurement and the Tarver polarizationethod to evaluate the corrosion rate of the cool storage agent to the test piece, and the anode dynamic cycle polarizationethod can be obtained. The inhibition efficiency of corrosion inhibitors on pitting corrosion was investigated. Finally, electrochemical impedance spectroscopy was used to understand the corrosionechanism and corrosion inhibitionechanism of aluminum foil test pieces. |
