Cover Picture: Materials and Corrosion. 4/2020

Cover: Hydrolysis of anionic polyacrylamide (HPAM) adsorbs on the surface of metal to form a network of protective fi lm. The corrosion scales of N80 steel includes an inner film which is composed of FeCO₃ and an outer film composed of FeS₂ in HPAM/H₂S/CO₂ environment. More detailed information can be found in: Baojun Dong, Dezhi Zeng, Zhiming Yu, Haixin Zhang, Huiyong Yu, Gang Tian, Yonggang Yi, Role of polyacrylamide concentration on Corrosion Behavior of N80 steel in the HPAM/H₂S/CO₂ environment, Materials and Corrosion 2020 , 71, 526.