Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection / Ru Yan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 267-280 Titre : Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection Type de document : texte imprimé Auteurs : Ru Yan, Auteur ; Xiang Gao, Auteur ; Wei He, Auteur ; Yan Wang, Auteur ; Houyi Ma, Auteur Année de publication : 2024 Article en page(s) : p. 267-280 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Adhésion Anticorrosifs Anticorrosion Complexation (chimie) Ions zinc Métaux -- Revêtements protecteurs Revêtement de conversion Index. décimale : 667.9 Revêtements et enduits Résumé : The eco-friendly PAA/Zn2+ conversion coatings, composed of PAA-Zn2+ complex and ZnO/Zn(OH)2, have been prepared by taking advantage of coordination-driven assembly method for suppressing steel corrosion. Because of high affinity of PAA for steel surface and various metal ions, metal ions-assisted organic molecule assembly strategy used to construct chemical conversion film on metal surface has been extended to the design and construction of polyelectrolyte–metal complex conversion coating. In this work, some film properties associated closely with film formation time containing corrosion resistance, surface microstructures, and chemical compositions were carefully investigated by using electrochemical measurements, morphologies tests, and spectra analysis and possible film-forming mechanism of PAA/Zn2+ film was proposed. The highest charge transfer resistance (Rct = 24,960 ohm cm2) was recorded for PAA/Zn2+ film based on EIS, which is about 30 times higher than that of the bare steel. And minimum corrosion current density (icorr = 1.01 × 10-7 A cm-2) was obtained for PAA/Zn2+ film from polarization curves, which is only 3.34% of that obtained from bare steel. Herein, the PAA/Zn2+ conversion coatings constructed between 30 and 60 min present outstanding corrosion resistance performance and the protection efficiencies are greater than 90%. Furthermore, PAA/Zn2+ films have a positive effect on improvement in adhesion of epoxy coating on steel surface, which can further improve corrosion resistance of whole paint system, especially for PAA/Zn2+ films fabricated for long film formation time (e.g., 30 min and 45 min). Due to environmental friendliness, strong corrosion resistance, and good adhesion performance, PAA/Zn2+ conversion coatings are expected to be an ideal substitute for the traditional chromating process. Note de contenu : - EXPERIMENTAL : Materials and chemical reagents - Chemical conversion treatment - Epoxy primer treatment - Anticorrosion performance evaluation - Surface observation and analysis - RESULTS AND DISCUSSION : Corrosion resistance of PAA/Zn2+ conversion films - EIS tests - Polarization curves - Surface characterization - SEM and EDS analysis - Corrosion protection performance of paint system - Table 1 : Electrochemical parameters of naked steel and steel covered by PAA/Zn2+ films determined from EIS measurements - Table 2 : Corrosion electrochemical parameters for the naked steel and the modified steel by PAA/Zn2+ films in 3.5 wt% NaCl solution DOI : https://doi.org/10.1007/s11998-023-00818-y En ligne : https://drive.google.com/file/d/1nO0pvQ-ysQZzdu6BQbZUTdvFu7SoQlN1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40446 [article]

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