Poly(vinyl alcohol–proline) as corrosion inhibitor for mild steel in 1M hydrochloric acid

Abstract

Corrosion inhibitive behavior of newly synthesized water soluble semiconducting polymer composite poly(vinyl alcohol-proline) (PVAP) is focused in this article. The polymer was characterized by FTIR, SEM-EDX, and XRD techniques. Thermogravimetry and differential thermal analysis proved the thermal stability of PVAP. Gravimetry and electrochemical techniques were employed to study the corrosion inhibition performance of PVAP on mild steel in molar hydrochloric acid. 0.6 % (wt.) of PVAP provides a maximum inhibition efficiency of 94 % at 303 K. The role of concentration of PVAP, exposure time and solution temperature on the mild steel corrosion has been investigated. The polarization results showed that PVAP acts as mixed-type inhibitor and could serve as an effective corrosion inhibitor for mild steel in acid medium. Surface morphology of the mild steel specimen by FTIR spectroscopy proved the formation of polymer film.

Study of corrosion inhibition of C38 steel in 1 M HCl solution by polyethyleneiminemethylene phosphonic acid

“…It is evident from Table 5 that the value of DH°a increased in the presence of PEIMPA than the uninhibited solution indicating protection efficiency. This suggested the slow dissolution and hence lower corrosion rate of mild steel [2,7]. This result permits verifying the known thermodynamic equation between E a and DH°a [42]:…”

“…Because of the aggressive nature of the acid medium, the inhibitors are commonly used to reduce acid attack on the substrate metal. Most of the reported corrosion inhibitors are organic compounds containing O, N, S, and P [1][2][3][4][5][6][7][8][9][10][11][12][13][14] in their structures. The phosphoric functions are considered to be the most effective chemical group against corrosion process [15].…”

Investigation of polyacrylamide containing capsaicin monomer as a novel corrosion inhibitor for mild steel in hydrochloric acid

“…They have been extensively researched because of their high efficiency, inherent stability, and environmental friendliness. For example, poly(vinyl alcohol–proline) can achieve an inhibition efficiency of 94% at 303 K . The heterocyclic ring, polar functional groups with N, and the O and S atoms in polymer inhibitors can be absorbed on the metal surface to form complexes with metal ions.…”

Chitosan Schiff base as eco-friendly inhibitor for mild steel corrosion in 1 M HCl

“…The ∆H* values are found to be less for inhibited solutions when compared to blank suggesting the slower dissolution of MS in presence of inhibitor. [37,38] The positive values of ∆S* for the blank shows an increase in disorderliness that takes place during a metal dissolution process. Table 4 shows that the values of ∆S* moves towards negative after the addition of inhibitor.…”