扫描电化学显微镜原位观察碳钢涂层缺陷处的交流腐蚀行为
|
|
公维炜, 杨丙坤, 陈云, 郝文魁, 王晓芳, 陈浩
|
In Situ SECM Observation of Corrosion Behavior of Carbon Steel at Defects of Epoxy Coating under AC Current Conditions
|
|
GONG Weiwei, YANG Bingkun, CHEN Yun, HAO Wenkui, WANG Xiaofang, CHEN Hao
|
|
表2 各等效电路元件拟合结果
|
Table 2 Fitted values of the elements of the equivalent circuit
|
|
| AC current density | Immersion time | Cf /μF·cm-2 | Qd | Rf /Ω·cm2 | Rp /Ω·cm2 |
|---|
Cd /μF·cm-2 | n |
|---|
| 50 A/m2 | 0 h | 2.71×10-3 | 6.66 | 0.79 | 164.3 | 8.95×104 | | 5 h | 7.87×10-3 | 55.5 | 0.75 | 116.9 | 6.17×104 | | 10 h | 8.59×10-3 | 31.5 | 0.95 | 45.94 | 20.55 | | 24 h | 3.72×10-3 | 103.1 | 0.70 | 119.3 | 5.06×104 | | 100 A/m2 | 0 h | 2.71×10-3 | 6.66 | 0.79 | 164.3 | 8.95×104 | | 5 h | 3.90×10-3 | 8.09 | 0.80 | 136.5 | 4.95×104 | | 10 h | 1.12×10-2 | 273 | 0.70 | 36.55 | 1.51×104 | | 24 h | 1.18×10-2 | 46.6 | 0.78 | 114.6 | 5.65×104 | | 300 A/m2 | 0 h | 8.33×10-3 | 9.65 | 0.77 | 138.9 | 6.77×104 | | 5 h | 1.49×10-2 | 94.9 | 0.74 | 68.73 | 3.09×104 | | 10 h | 15.9 | 68.4 | 0.66 | 67.69 | 1.30×104 | | 24 h | 9.06×10-3 | 71.8 | 0.75 | 252.8 | 3.34×104 |
|
|
|