1. Electrochemistry and Corrosion Laboratory, School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China
2. Jiangsu Kexiang Anticorrosion Materials Co., Ltd, Changzhou 213100, China
3. Zhejiang Fangyuan Test Group, Hangzhou 310018, China
4. CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd, Changzhou 213016, China
5. Key Lab. of Fluid Transmission Technology of Zhejiang Province, Zhejiang, Sci-Tech University, Hangzhou, 310018, China