交流阻抗法評估增塗三聚磷酸鋁漆之抗蝕性

Evaluation of the Corrosion Resistance of Aluminum Tripolyphosphate Coated on Steels by Impedance Measurements

本文以電化學阻抗法量測於抗指紋鋼（中碳表面鍍有薄鉻）表面塗以面漆與增塗三聚磷酸鋁漆後於3.5% NaCl水溶液中的抗蝕性，由浸滯時間而取得連續數據的變化，得到反應中的電阻值與電容值改變，隨著浸滯時間的增長則電容值上升電阻值下降，而利用此兩種（電阻值與電容值）特性更能說明增塗三聚磷酸鋁漆後的抗蝕性。

The electrochemical impedance measurements were carried out in a 3.5 % NaCl solution for Cr-coated plain carbon steels. Steels with two types of surface paintings containing polyesters and with or without an extra layer of aluminum tripolyphosphate were studied in this work. The variations of capacities and resistance verse immersion time were investigated. It has found that the capacity increased but the resistance decreased with increasing immersion time which indicates the degradation of coating layers. It is observed that the steel with an extra layer of aluminum tripolyphosphate has better corrosion resistance.