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A novel method to control the release rate of halloysite encapsulated Na2MoO4 with Ca2+ and corrosion resistance for Q235 steel

Xuteng Xing,Dan Zhou,E. Tang,Shaojie Liu,X. Chu,Xiaodong Xu,Yongquan Xu

Published 2020 in Applied Clay Science

ABSTRACT

Abstract The natural halloysite nanotubes were used as the nanocontainer to load Na2MoO4 corrosion inhibitor, and the release rate of Na2MoO4 was further controlled by wrapped with the CaMoO4 end stopper through adding with Ca2+. The variable release rates were fulfilled by the formation of CaMoO4 end stopper with different strength, and the release time can be adjusted from one to dozens of hours. Moreover, the prepared complex corrosion inhibitor is also an acid-responsive smart material, which can quickly release the large amount of corrosion inhibitors under acidic conditions through the decomposition of insoluble CaMoO4 complex on the surface or end of halloysite. In addition, the epoxy coating mixed with 10 wt% Ca2+ treated Na2MoO4 loaded halloysite can provide the highest corrosion resistance and sustained release of the corrosion inhibitor to achieve corrosion healing in the coating defects.

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