The corrosion inhibition of 2,4-diaminopyrimidine (DAP) to cold rolled steel (CRS) in 1.0 mol/L HCl solution was studied through immersion test, electrochemical test and scanning electron microscopy (SEM). The results show that DAP was a good inhibitor for CRS in HCl solution. The inhibition efficiency increased with the increase of the concentration of DAP, and the maximum inhibition efficiency could reach as high as 94.8% when the concentration of DAP was 10.0 mmol/L. DAP acted as a mixed-type inhibitor and the adsorption of DAP on the surface of cold rolled steel obeyed Langmuir adsorption isotherm. As the temperature rose, the inhibition efficiency decreased.
【3】AWAD H S,ABDEL G S. Mechanism of inhibition of iron corrosion in hydrochloric acid by pyrimidine and series of its derivatives[J]. Anti-Corrosion Methods and Materials,2005,52:328-336.
【4】ABDALLAH M,HELAL E A,FOUDA A S. Aminopyrimidine derivatives as inhibitors for corrosion of 1018 carbon steel in nitric acid solution[J]. Corrosion Science,2006,48(7):1639-1654.
【5】MASOUND M S,AWAD M K,SHAKER M A,et al. The role of structural chemistry in the inhibitive performance of some aminopyrimidines on the corrosion of steel[J]. Corrosion Science,2010,52:2387-2396.
【6】LI X H,XIE X G. Adsorption and inhibition effect of two aminopyrimidine derivatives on steel surface in H2SO4 solution[J]. Journal of the Taiwan Institute of Chemical Engineers,2014,45:3033-3045.
【7】ASHASSI-SORKHABI H,MAJIDI M R,SEYYEDI K. Investigation of inhibition effect of some amino acids against steel corrosion in HCl solution[J]. Applied Surface Science,2004,225(1/4):176-185.
【8】TANG L B,MU G N,LIU G H. The effect of netural red on the corrosion inhibition of cold rolled steel in 1.0 M hydrochloric acid[J]. Corrosion Science,2003,45:2251-2262.
【9】BENPOUR M,GHOREISHI S M,SOLTANI N,et al. The inhibitive effect of some bis-N,S-bidentate Schiff bases on corrosion behaviour of 304 stainless steel in hydrochloric acid solution[J]. Corrosion Science,2009,51:1073-1082.
【10】BENTISS F,LEBRINI M,LAGRENEE M. Thermodynamic characterization of metal dissolution and inhibitor adsorption processes in mild steel/2,5-bis(n-thienyl)-1,3,4-thiadiazoles/hydrochloric acid system[J]. Corrosion Science,2005,47:2915-2931.
【11】VRACAR L M,DRAZC D M. Adsorption and corrosion inhibitive properties of some organic molecules on iron electrode in sulfuric acid[J]. Corrosion Science,2002,44:1669-1680.
【12】SOLMAZ R,KARDAS G,YAZICI B,et al. Adsorption and corrosion inhibitive properties of 2-amino-5-mercapto-1,3,4-thiadiazole on mild steel in hydrochloric acid media[J]. Colloids and Surfaces A:Physicochemistry and Engineering Aspects,2008,312:7-17.
【13】MORETTI G,GUIDI F,GRION G. Tryptamine as a green iron corrosion inhibitor in 0.5 M deaerated sulphuric acid[J]. Corrosion Science,2004,46:387-403.
【14】TANG Y M,ZHANG F,HU S X,et al. Novel benzimidazole derivatives as corrosion of mild steel in the acidic media. Part I:Gravimetric,electrochemical,SEM and XPS studies[J]. Corrosion Science,2013,74:271-282.
【15】MARKHALI B P,NADERI R,MAHDAVIAN M,et al. Electrochemical impedance spectroscopy and electrochemical noise measurements as tools to evaluate corrosion inhibition of azole compounds on stainless steel in acidic media[J]. Corrosion Science,2013,75:269-279.
【16】QIAN B,WANG J,ZHANG M,et al. Synergistic effect of polyaspartic acid and iodide ion on corrosion inhibition of mild steel in H2SO4[J]. Corrosion Science,2013,75:184-192.
【19】BOMMERSBACH P,ALEMANY-DUMONT C,JEAN-PIERRE M,et al. Hydrodynamic effect on the behaviour of a corrosion inhibitor film: characterization by electrochemical impedance spectroscopy[J]. Electrochimica Acta,2006,51:4011-4018.
【20】SCHWEINSBERG D P,ASHWORTH V. The inhibition of the corrosion of pure iron in 0.5 M sulphuric acid by n-alkyl quaternary ammonium iodides[J]. Corrosion Science,1988,28:539-545.
【21】LAGRENEE M,MERNARI B,BOUANIS M,et al. Study of the mechanism and inhibiting efficiency of 3,5-bis(4-metylthiophenyl)-4H-1,2,4-triazole on mild steel corrosion in acidic media[J]. Corrosion Science,2002,44:573-588.