Experimental study on the characteristics of sandstone subjected to acid corrosion

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Huo, Run Ke^1 ; Li, Shu Guang^1 ; Han, Fei^1 ; Li, Jing^2

School of Civil Engineering, Xi'An University of Architecture and Technology, Xi'an, SHANXI

710055, China^1

Zhengzhou Nuclear in Geotechnical Engineering Ltd, Zhengzhou, HENAN

450008, China^2

关键词: Acid corrosion;    Longitudinal wave velocity;    Mass loss;    Mass loss rate;    Rate of change;    Rate of increase;    Velocity detection;    Wave velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/2/022031/pdf
DOI  :  10.1088/1755-1315/153/2/022031

来源: IOP

【 摘 要 】

The purpose of this paper is to study the change of sandstone properties during acid corrosion. With the help of velocity detection and chemical analysis, the mass loss, longitudinal wave velocity and the concentration of Ca2+ dissolved in the solution are analyzed. Experimental results show that: within 0∼30 days, the corrosion rate is the fastest, the mass loss rate, the wave growth rate and the growth rate of Ca2+ concentration are faster. Within 30∼60 days, the rate of change of the indexes are slower, indicating that corrosion rate became slow gradually. Within 60∼90 days, the indexes tend to be stable, indicating that corrosion rate tends to be stable, which shows that the acid corrosion of sandstone have certain stages. The corrosion rates of sandstone in solutions with different pH values are different. The stronger the acidity, the greater the corrosion rate, the rate of increase of Ca2+ and the increase rate of the wave velocity of the samples at the initial stage of the reaction.