| Title |
A Study on the Corrosion Fatigue Characteristics of Organic Coated Steels for Automotive |
| Authors |
전우석(Woo Seok Jeon); 최윤석(Yoon Seok Choi); 심은기(Eun Gi Shim); 김정구(Jung Gu Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
automotive; organic coating; accelerated test; DSC; potentiodynamic test; corrosion fatigue; SEM |
| Abstract |
The corrosion fatigue properties of organic coated automotive steel were investigated in 3.5 wt.% NaCl solution by polarization test, corrosion test and SEM analysis. The corrosion fatigue lifetime of bare steel is longer than that of organic coated steel, indicating that the organic coated steel is more susceptible to corrosion fatigue cracking to the bare steel. The shallow surface penetration of bare steel associated with cyclic stress is not related to corrosion fatigue cracking. On the contrary, the organic coating is ruptured by cyclic stress and environmental degradation, thereby permitting the anodic dissolution of the freshly exposed bare which facilitates fatigue crack initiation. |