硫化氫腐蝕防護研究

The Study in the Prevention of H2S-induced Corrosion

電子設備在戶外及室內環境，皆有可能因為腐蝕性氣體的存在而受損。本研究針對遭受硫化氫污染的硫磺地熱區及一般都會區兩個現場案例，以不同的解決方案進行腐蝕防護及追蹤測試。主要的防護措施包括了濕度控制及氣相腐蝕抑制劑應用。各個解決方案在現場應用之前，皆先經過實驗室模擬研究以尋求最佳的防護效果。主要的實驗室模擬研究包括了流動式混合氣體試驗、機箱濕度控制及薄液層的電化學量測技術等項目。研究結果顯示，相對濕度低於60%可以有效減少硫化氫侵蝕，氣相腐蝕抑制劑則能夠提供更佳的防護。另外，利用交流阻抗技術量測薄液層中的電化學訊息，有助於氣相腐蝕抑制劑的選用。

The electronic equipment would be damaged by the corrosive gas in outdoor and indoor environment. In this study, different prevention method was evaluated in two different field cases, respectively in sulfur geothermal region and metropolitan region polluted by the hydrogen sulfide (H2S). These corrosion prevention methods include the control of humidity and the application of the vapor phase corrosion inhibitor (VPI). Before the field testing, laboratory research were conducted to achieve the best prevention effect for the field application. These major laboratory researches include a flowing mixed-gas test, the humidity-controlling of cabinet and the thin-electrolyte- layer electrochemical technique. The results indicated that the humidity lower than 60 % can significantly decrease the H2S attack. Meanwhile, VPI will suggest more effective prevention from H2S-induced corrosion than the humidity-controlling method. In addition, it will be helpful for choosing the VPI by the electrochemical impedance measurements in the thin-electrolyte- layer.