**Chapter 4**

*Corrosion Inhibitors*

[46] Ong CC, Karim KA. Inhibitory effect of red onion skin extract on the corrosion of mild steel in acidic medium. Chemical Engineering Transactions. 2017;**56**:913-918

[47] Bao J, Zhang H, Zhao X, Deng J. Biomass polymeric microspheres containing aldehyde groups:

Immobilizing and controlled-releasing amino acids as green metal corrosion inhibitor. Chemical Engineering Journal. 2018;**341**:146-156

**58**
