本研究以電化學原子力顯微鏡(ECAFM)於0.001 M NaCl(aq)環境中即時(In-Situ)觀察T91 原材及T91 銲道材的腐蝕現象。此外並再利用恆電位儀，測量T91 原材及T91 銲道材之開路電位及腐蝕行為，並利用掃瞄式電子顯微鏡(SEM)及EDX 分析試片表面之腐蝕情況及孔蝕(Pitting)氧化物成份。
原子力顯微鏡可以即時觀察T91 原材及T91 銲道材於0.001 M NaCl(aq) 環境中的過程，可觀察出試片表面的生成物組成大小及電流-電位的變化。經由電化學原子力顯微鏡以及不同的電位試驗條件在試片表面掃描後，根據實驗數據所示，可發現T91 原材的抗腐蝕性比T91 銲道材佳。

The electrochemical atomic force microscopy (ECAFM) has been dispatched to investigate the in-situ corrosion phenomena of the T91 alloy and T91 weld alloy in 0.001 M NaCl(aq) solution. A potentialstate is also used to analyze the corrosion voltage and corrosion pits of T91 alloy and T91 weld alloy. The pits phases of the corrosion products were examined by an SEM and X-ray diffractometer.
ECAFM can perfrom status of In-Situ corrosion in each conditions From CV(Cyclic voltammogram)curves can figure out anti-corrosion capability of T91 alloy and T91 weld alloy, base on experiment result shown anti-corrosion of T91 alloy is better than T91 weld alloy.

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