Corrosion inhibition, adsorption behaviour, and thermodynamic studies of red dragon fruit (Selenicereus costaricensis) waste peel extracts on mild steel in acidic environment

Indian Journal of Chemical Technology

article

Romulo R Macadangdang Jr¹ 

[1] College of Allied Health, National University

关键词: Corrosion;    Corrosion inhibition;    Adsorption;    Thermodynamic studies;    weight loss method;    Environment-benign coatings;    Article;   

学科分类：化学（综合）

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

Metal corrosion is brought about by the oxidation of atoms on the surface resulting in irreversible damage to structures at staggering costs. Hence, the search for efficient and cost-effective corrosion inhibitors is relevant. In this study, the ethanolic extract of Red Dragon Fruit (Selenicereus costaricensis) waste peels (RDF) has been tested for its anti-corrosion property using the weight loss method at different temperatures (303-343 K). The calculated inhibition efficiency of 2% RDF is 97%. Thermodynamic studies reveal that increasing inhibitor concentration raises the activation parameters of mild steel in acidic media such as activation energy (Ea) and changes in enthalpy (Ho) and entropy (So). Moreover, increased immersion time, inhibitor concentration, and temperature led to increased inhibition efficiency. The spontaneous process (Go ads = -23.47 kJ/mol) of adsorption of RDF on mild steel surfaces obeys the Langmuir isotherm model. Lastly, optical microscopy of the inhibited and uninhibited systems confirms the potential of the RDF against pitting corrosion.

【 授权许可】

CC BY-NC-ND