Corrosion behavior of typical hot rolled sheets in humid storage environments

Abstract

Purpose The purpose of this paper was to study the relationship between safe storage life and storage mode of hot-rolled sheet (Q235, X70) in humid environment, and a prediction model of safe storage life under different storage modes was established. Design/methodology/approach The corrosion behavior of hot-rolled sheets under different storage conditions was studied with immersion experiment and morphology observation. Findings The results show that pitting occurs on the hot-rolled sheets in humid environment, and the corrosion behavior is strongly related with the storage mode. When they are stored separately, the number and depth of pits first increase and then decrease as the Cl− concentration rises, while for the stack storage, pit depth increases with increasing Cl− concentration. The safe storage time of separate storage is longer than that of stack storage. Based on this, a model of chloride ion concentration and storage life was established. Originality/value A storage safe life model of hot-rolled sheet in humid environment is proposed.

Causes and Prevention Measures of Bright Pitting Defects on Surface of Hot-Rolled Galvalume Steel Sheets

“…Besides, the GL coating also exhibits good mechanical properties, high temperature resistance, heat reflection, and pleasing appearance, and it has been widely used in industries such as construction, automobile manufacturing, home appliance manufacturing, and transportation, etc. [1][2][3][4][5]. In recent years, the market has posed clear demands on the individuation of products, and so is the case for hot-dip galvanized steel sheets.…”