1 Corrosion and Inhibition Performances at the Steel-Mortar Interface. Part 1: A Surface Analytical Investigation Zhengxian Yang 1 , Xianming Shi 1,2, * , Tuan Anh Nguyen 1 , Zhiyong Suo 3 , Recep Avci 3 1 Corrosion and Sustainable Infrastructure Laboratory, Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USA 2 Civil Engineering Department, 205 Cobleigh Hall, Montana State University, Bozeman, MT 59717-2220, USA 3 Imaging and Chemical Analysis Laboratory, Department of Physics, Montana State University, Bozeman, MT 59717, USA * Corresponding Author; Phone: 1-406-994-6486; Fax: 1-406-994-1697; E-mail: Xianming_s@coe.montana.edu