本研究主要探討鎳基182合金原銲道及經400℃/200h、620℃/24h、620℃/24h＋400℃/200h和1100℃/24h熱處理後銲道敏化的現象。在本研究中評估銲道敏化現象的方法包含TEM分析、改良式惠式試驗法與雙環動電位再活化法。
由TEM的金相結果可以觀察到不論是原銲道或經不同熱處理的試片，碳化物都會在晶界上析出。從晶界上往兩邊取點做EDS分析後，發現經620℃/24h及620℃/24h＋400℃/200h熱處理的這兩組鎳基182合金銲道，缺鉻區與基材的鉻濃度差較As-welded及400℃/200h熱處理的試片大。
從改良式惠式試驗法的結果中，經620℃/24h及620℃/24h＋400℃/200h熱處理的這兩組鎳基182合金銲道，重量損失率明顯高於As-welded，400℃/200h及1100℃/24h熱處理的試片。所以從TEM與化學試驗法分析的結果得知620℃/24h及620℃/24h＋400℃/200h熱處理的鎳基182合金銲道有敏化的現象發生。
雙環動電位再活化法中採用的測試溶液為硫酸加上硫代乙醯胺。從測試的結果中發現，硫代乙醯胺濃度較低時，於鎳基182合金銲道再活化過程中具有活化的作用，Ir/Ia的比值較未添加時高。當硫代乙醯胺濃度較高達到0.01 M時，於合金再活化過程中則會抑制腐蝕的發生，Ir/Ia的比值反而比為添加時低。所以從實驗的結果中發現，0.05 M的硫酸加上0.003 M的硫代乙醯胺對鎳基182合金銲道經不同熱處理後的敏化程度有較佳的鑑別率。

This research investigates the sensitization phenomenon in alloy 182 weld metal with different heat treatment. In this study, we use TEM analysis, modified Huey test, and double loop electrochemical potentiokinetic reactivation test to evaluate the degree of sensitization of alloy 182 weld metal.
The result of TEM analysis indicated that carbides were precipitated along grain boundary in alloy 182 weld metal. And the Cr concentration beside grain boundary of alloy 182 weld metal with 620℃/24h and 620℃/24h＋400℃/200h heat treatment were much lower than as-welded and 400℃/200h.
From the result of modified Huey Test, the weight loss of alloy 182 weld metal with 620℃/24h and 620℃/24h＋400℃/200h heat treatment were much higher than as-welded , 400℃/200h and 1100℃/24h. By Comparing the result of TEM analysis and modified Huey Test, the phenomenon of sensitization of alloy 182 weld metal with 620℃/24h and 620℃/24h＋400℃/200h heat treatment occurred.
In double loop electrochemical potentiokinetic reactivation test, we use H2SO4 + CH3CSNH2 to be test solution. After test, we find when the concentration of CH3CSNH2 was lower, alloy 182 weld metal were been active during reactivation process. But when the concentration of CH3CSNH2 was higher to 0.01 M, the corrosion of alloy 182 weld metal were been inhibit. From the experimental result, 0.05 M H2SO4+ 0.005 M CH3CSNH2 was the optimum condition to evaluate the degree of sensitization of alloy 182 weld metal with different heat treatment.

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