以電化學技術分析冷軋材表面狀態對磷化反應影響

The Effect of Surface Status of Cold-rolled Steel on Phosphating by Electrochemical Analysis

本研究利用電化學技術分析高強度冷軋鋼板表面狀態對磷化反應之影響。影響鋼板表面狀態之因素主要分為兩部份：首先磷化製程中，表面調整處理對磷化反應之作用；其次，煉鋼製程中，合金元素差異對磷化反應之影響。第一部分主要探討表面調整處理工序之施作，對冷軋鋼板磷化反應影響；第二部分則側重於瞭解鋼板表面合金元素分佈或氧化層厚度與磷化反應趨勢之相關性。利用開路電位法量測表面於磷化反應之電位變化發現，經表面調整處理後之冷軋鋼板表面磷化反應明顯，觀察其磷酸鹽結晶具較佳之均勻性；以電化學交流阻抗法分析不同退火製程之冷軋鋼板發現，較高還原性氣氛之鋼板表面阻抗值較小，有助後續磷化反應進行。

The effect of surface status of cold rolled steel on phosphating would be investigated by electrochemical analysis. There are two main factors of steel on phosphating, including phosphating treatment processes and steel manufacturing. First, surface conditioner process might affect the reaction of phosphating. Second, the alloying design would be the main factor to influence the initiation of phosphating. To realize the behaviors of surface conditioner and alloying design on phosphating of substrate, open circuit potential measurement and electrochemical impedance spectroscopic analysis were used individually. More uniform phosphating nucleate can be found on the steel after surface conditioner process and resulted in a more fluctuated potential by open circuit potential measurement. After electrochemical impedance spectroscopic analysis, lower resistance on steel surface produced under higher reductive environment while annealing would be detected with more compact phosphating morphology.