The Stability of the Passive Layer on Mild Steel Surface in NaCl, NaOH, HCl, and H2SO4 Solutions Using Carboxymethyl Chitosan as a Corrosion Inhibitor

Maria Erna, Emriadi ., Admin Alif, Syukri Arief

Abstract


This paper studies the stability of the passive layer formed on the surface of mild steel using inhibitors of Carboxymethyl Chitosan (CMCh) with potentiodynamic polarization method and lost weight as well as the steel surface morphology characterized by SEM-EDS equipment. The results show that the stability of the coating on the steel surface is influenced by the environment. For environmental distilled water, NaCl and NaOH stability is more stable than the layer of HCl and H2SO4 environment. The images morphology and spectrum of equipment Microscope- Scanning Electron Energy Dispersive X-ray Spectroscopy (SEM-EDS) show that the surface layer of mild steel in H2SO4 suffers more damage than in HCl which is marked by the formation of holes in the steel surface is more going on.

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