| Titre : | Simulating study of atmospheric corrosion of galvanized steels : Influence of zinc rusts on the formation of β - FeOOH rust particles by aerial oxidation of aqueous FeCl2 solution (2012) |
| Auteurs : | Hidekazu Tanaka, Auteur ; Tatsuya Kitazawa, Auteur ; Nagisa Hatanaka, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 1, Janvier 2012) |
| Article en page(s) : | pp. 248-254 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Oxidation Steel Atmospheric corrosion |
| Résumé : | To simulate the corrosion of galvanized steel in a marine zone, steel rust of β-FeOOH particles was prepared by aerial oxidation of aqueous FeCl2 solutions containing ZnCl2 and zinc rusts such as ZnO and zinc hydroxychloride (Zn5(OH)8Cl2·H2O, ZHC). The crystallinity and particle size of β-FeOOH were slightly decreased by adding the ZnC12. The produced particles contained a small amount of ZnCl2, while the zinc rusts of ZnO and ZHC markedly impeded the crystallization and particle growth of β-FeOOH. In the presence of a large amount of zinc rusts, the formation of β-FeOOH was suppressed and γ-FeOOH and ZHC of which the particle size was larger than that of β-FeOOH were generated. The inhibitory effect on the formation of β-FeOOH was on order of ZHC ≈ ZnO ≫ ZnCl2. The effect of zinc rusts was ascribed to the increment of solution pH by dissolution of rust particles and adsorption of Zn(II) on a precursor of β-FeOOH particles. The adsorption of CO2 on the products was also suppressed by the addition of ZnCl2 and zinc rusts. These results imply that the β-FeOOH rust formed on galvanized steel in a marine environment is more compact, leading to improved corrosion resistance. However, existence of a large amount of zinc rust particles inhibits the formation of a compact rust layer and lowers the ability for corrosion resistance. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://cat.inist.fr/?aModele=afficheN&cpsidt=25476468 |
