1. Zhejiang Nanhua Anti-corrosion Equipment Co., LTD., Hangzhou 311255, China
2. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, No. 727, Jingming South Road, Chenggong New District, Kunming 650500, China
3. Faculty of Business Management, Yunnan Communications Vocational and Technical College, Kunming 650500, China