Modeling research of initial atmospheric corrosion of Q235 carbon steel based on electrical resistance probe

Abstract

Purpose This paper aims to discover the mathematical model for Q235 carbon steel corrosion date acquired in the initial stage of atmospheric corrosion using electrical resistance probe. Design/methodology/approach In this paper, mathematical approaches are used to construct a classification model for atmospheric environmental elements and material corrosion rates. Findings Results of the experiment show that the corrosion data can be converted into corrosion depth for calculating corrosion rate to obtain corrosion kinetics model and conform corrosion acceleration phase. Combined with corresponding atmospheric environmental elements, a real time grade subdivision model for corrosion rate can be constructed. Originality/value These mathematical models constructed by real time corrosion data can be well used to research the characteristics about initial atmospheric corrosion of Q235 carbon steel.

Corrosion behaviour of carbon steel in Beibu Gulf tidal zone

“…Further, the average corrosion rate of CS is calculated with the following equation [25]: where V c is the average corrosion rate (μm/a) and m is the period of sampling (when m = 1, 2, 3, 4, 5, and 6, the specimens are exposed for 60, 120, 180, 240, 300 and 360 days, respectively). Figure 2(b) depicts the variation of the average corrosion velocity ( V c ) with exposure time.…”

“…It can be seen that the thickness loss of CS increased gradually when corrosion time grew, and the R 2 values tending to 1 indicate that the corrosion kinetics of CS in the tidal zone is consistent with Equation (2). Further, the average corrosion rate of CS is calculated with the following equation [25]:…”