Two phenylpyrimidine derivatives as new corrosion inhibitors for cold rolled steel in hydrochloric acid solution

Inhibition effect of two mercaptopyrimidine derivatives on cold rolled steel in HCl solution

“…92.7% and 84.3% for AHMP and DHMP, respectively. Similar changing rules have been reported for other pyrimidine derivatives [3,12]. The reasons could be attributed to the adsorptive film of inhibitor that lies in the immersion time.…”

“…It is found that increasing the number of substitution group to pyrimidine ring could also improve the inhibition efficiency [10,11]. Recently, two phenylpyrimidine derivatives of 4-phenylpyrimidine (4-PPM) and 5-phenylpyrimidine (5-PPM) were reported as good corrosion inhibitors for steel in HCl by our work team [12]. The result further shows that the substitution position of phenyl group (-C 6 H 5 ) has important effect on inhibition efficiency [12].…”

“…Recently, two phenylpyrimidine derivatives of 4-phenylpyrimidine (4-PPM) and 5-phenylpyrimidine (5-PPM) were reported as good corrosion inhibitors for steel in HCl by our work team [12]. The result further shows that the substitution position of phenyl group (-C 6 H 5 ) has important effect on inhibition efficiency [12]. In a word, the substitution group can markedly change the adsorption and inhibitive performance, and so the study of the relationship between molecular structure and inhibition is of great importance.…”

Corrosion inhibition of mild steel by two new S-heterocyclic compounds in 1 M HCl: Experimental and computational study

“…Then, for further potential values, the desorption potential ‫ܧ(‬ ୢୣୱ ), the anodic currents increase sharply and dissolve at a small βa2 slope section II and a flat is observed at this stage. This flat can be attributed to the equilibrium of adsorption and desorption of inhibitor molecules on mild steel surface [54], and the desorption finishes at the end of this region. For section III, the anodic current densities change considerably, resulting in a sharp increase in Tafel slope β a3 in the high polarization potential region.…”

“…The CPE element is used to explain the depression of the capacitance semi-circle, which corresponds to surface heterogeneity resulting from surface roughness, impurities, dislocations, grain boundaries, adsorption of inhibitors, formation of porous layers, etc. The impedance function of the CPE is represented by the expression[53,54]:…”