Abstract
The corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulphuric acid by diacetyl monoxime thiosemicarbazone (DAMTSC) at 303–323 K has been investigated by potentiodynamic polarization, EIS, and SEM techniques. Good inhibition efficiency of DAMTSC was revealed even at low concentrations, which increased with the increase in DAMTSC concentration and decreased with the increase in temperature. The activation energies, , as well as other thermodynamic parameters (; ; ), were evaluated and discussed. The adsorption of DAMTSC on the aged maraging steel surface was found to obey the Langmuir adsorption isotherm model and shows mixed type inhibition behavior.
Highlights
Corrosion of structural elements is a major issue for any industry because of the chemical environment of chemical processing
The presence of inhibitor does not shift the Ecorr remarkably, implying that diacetyl monoxime thiosemicarbazone (DAMTSC) acts as mixed type inhibitor affecting both anodic and cathodic reactions [23]
The inhibition efficiency decreases with increase in temperature which indicates desorption of inhibitor molecules [51]
Summary
Corrosion of structural elements is a major issue for any industry because of the chemical environment of chemical processing. Maraging steels are special class of ultrahigh strength steels that differ from conventional steels in that they are hardened by a metallurgical reaction that does not involve carbon [1]. They derive high strength from age hardening of low carbon, Fe-Ni martensitic matrix [2]. The present work is intended to study the corrosion inhibition of aged 18 Ni 250 grade maraging steel in 0.5 M sulphuric acid medium using DAMTSC as inhibitor
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
