Study on Cl- and SO42-affected to corrosion behavior of mine high water content hydraulic fluid

Cheng Xiangbang; Zhang Ziqiang; Meng Hechao

doi:10.13199/j.cnki.cst.2017.04.018

Abstract：In order to study Cl-and SO42-in the liquid preparation water affected to the corrosion behavior of the high water content hydraulic fluid,an electrochemical polarization curve was applied to study the corrosion behavior of high water content hydraulic fluid with different Cl-and SO42-density and discussed the mechanism affected to the corrosion behavior of the high water content hydraulic fluid.The results showed that with the Cl-and SO]-density increased,the pitting potential of 30CrMnSi material would be decreased and the corrosion resistance performances of the high water content hydraulic fluid would be reduced.When the Cl-in the liquid was increased from 0 to 200 mg/L,the pitting potential was decreased by 43％.When the SO42-in the liquid was increased from 0 to 400 mg/L,the pitting potential was decreased by 17％.The pitting potential and the Cl-and SO42-density would be in a linear relationship.The main mechanism affected to the corrosion resistance performances of the high water content hydraulic fluid would be the competitive adsorption of the anions.In the selection of the corrosion inhibitor and the application of the high water content hydraulic fluid,a corrosion inhibitor affected to anti Cl-and SO42-should be both selected in order to ensure the corrosion resistance performances of the high water content hydraulic fluid.