Preparation and controlled-release properties of a dual-response acidizing corrosion inhibitor

Abstract

In this study, HMSNs with a specific surface area of 900 m² g⁻¹ and a wall thickness of 50 nm were prepared by a soft template method. A cavity structure with a diameter of about 150 nm was constructed between the core and shell, and it had a mesoporous structure of 4.0 nm. Therefore, the core and shell particles have an ideal carrying capacity as a corrosion inhibitor carrier. Amino modified HMSNs and grafted ferrocene group to obtain FcHMSNs. Impregnation method and negative pressure method were used to load acidizing corrosion inhibitor, and nano-valves sensitive to REDOX potential and pH were used to block the mesopores of HMSNs. The acidizing inhibitor (DR-HMSNs@S-AFA) was completely encapsulated in micro/nano containers. The controlled release performance of DR-HMSNs@S-AFA acidizing inhibitor was studied. The results showed that the acidizing inhibitor with DR-HMSNs@S-AFA load could achieve rapid release under strong acidic conditions or a certain concentration of H₂O₂.