Corrosion kinetics and the relevance analysis for x80 steel in a simulated acidic soil solution and outdoor red soil

The evolution characteristics of corrosion-kinetics,-morphology and-products for X80 steel in a simulated acidic soil solution was acquired by means of weight loss measurement, SEM and XRD. Besides, the long-term corrosion-kinetics of X80 steel, which outdoor burried in real red soil at Nanchang district, was monitored in-situ by using a precise electrical resistance (ER) test system. The relevance between the simulated corrosion experiment and the outdoor soil exposure test were evaluated by using qualitative comparison and grey quantitative analysis. The results show that the corrosion weight loss of X80 steel in the simulated solution as a function of exposure time could be calculated using power function (△W=At ⁿ ). For the outdoor exposure in red soil, the corrosion kinetics of X80 steel was similar to that of the simulated test. It had good relevance between the indoor corrosion experiment and the outdoor soil exposure test, regardless of the corrosion kinetics, corrosion morphology and the composition of corrosion products. The correlation degree in the corrosion kinetics for the two methods was about 0.6233. Besides, GM(1,1) corrosion kinetic data prediction model had been established basing on indoor immersing experiment. After verification, the relative error of GM(1, 1) prediction model was less than 20%, which indicated that GM(1,1) model could be used to predict the outdoor soil exposure test result.