Electrochemical Study of Stainless Steel Anchor Bolt Corrosion Initiation in Corrosive Underground Water

Fangping Ma,Tong Wu,Qing Zeng,Xiangyu Lu,Tianyi Zhang,Xiao Lu,Xingguo Feng

doi:10.3390/pr9091553

Abstract

Application of low-nickel stainless steel anchor was one of the economical and effective methods to solve the durability problem of slope engineering. At present, there are scarce reports about corrosion characteristics of low-nickel stainless steel in various underground waters. For investigating the corrosion initiation of stainless steel anchor bolt in corrosive underground water, the effect of SO42−, HCO3− and pH value on the corrosion behavior of 201 low-nickel stainless steel was studied via electrochemical methods. As the SO42− concentration, HCO3− concentration or pH value increase, the open circuit potential and polarization resistance increase, while the double-layer capacitance, donor density and passive current density decrease. The results indicate that corrosion is inhibited by SO42−, HCO3− and OH− in underground water. In addition, the inhibitive efficiency of SO42− and HCO3− increases with the SO42− and HCO3− concentration.

Highlights

IntroductionSteel anchor bolt is widely applied in the high-steep slope in hydropower and transportation fields, as shown, which can maintain the slopes in stable conditions
Steel anchor bolt is widely applied in the high-steep slope in hydropower and transportation fields, as shown in Figure 1a, which can maintain the slopes in stable conditions.many anchor bolts were found to be seriously corroded, causing a collapse of slopes, for the corrosive ions in underground waters
The inhibitive effect of SO4 2− and HCO3 − is significant at low concentration while inefficiency at higher concentration

Summary

Introduction

Steel anchor bolt is widely applied in the high-steep slope in hydropower and transportation fields, as shown, which can maintain the slopes in stable conditions. Many anchor bolts were found to be seriously corroded, causing a collapse of slopes, for the corrosive ions in underground waters. Much attention was given to the durability of steel anchor bolts in the past several decades. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Methods

Results

Conclusion