Monitoring of a Zr-based conversion coating on galvanised steel and its performance against corrosion

被引：11
作者：
Piaggio Cardoso, Henrique Ribeiro [1 ]
Rapacki, C. [1 ]
Ferreira, J. Z. [1 ]
机构：
[1] Univ Fed Rio Grande do Sul, PPGE3M, LACOR Setor 4 Campus Vale Av Bento Goncalves, BR-91509900 Porto Alegre, RS, Brazil
来源：
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY | 2019年 / 54卷 / 08期
关键词：
Conversion coating; coating formation; galvanised steel; corrosion; ZINC; RESISTANCE; LAYER;
D O I：
10.1080/1478422X.2019.1657703
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New protective coatings with satisfactory performance and low impact are required by the surface treatment industry as effective Cr(VI)-free substitutes. Recently conversion coating systems containing Zr/Ti have shown great promise particularly for zinc finishes on steel and in this paper, we study the influence of bath conditions (e.g. pH and time) on conversion layers composed of a Zr-based film. The coating formation was studied by simultaneous monitoring of open circuit potential and surface pH using a novel cell design. Samples were subsequently characterised by electrochemical impedance spectroscopy in NaCl over a 24-hour period. The system demonstrates a correlation between pH of formation and corrosion resistance.
引用
收藏
页码：726 / 730
页数：5
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