Hexafluorozirconic acid (cas 12021-95-3) based surface pretreatments: Characterization and performance assessment

Add time:07/27/2019    Source:sciencedirect.com

A new phosphate-free pretreatment from Henkel Corp. named TecTalis®, was investigated. The treatment bath is composed of dilute Hexafluorozirconic acid (cas 12021-95-3) with small quantities of non-hazardous components containing Si and Cu. The corrosion resistance of treated steel was compared to samples treated in a phosphate conversion coating bath, in simple hexafluorozirconic acid and in TecTalis without the addition of the Cu-containing component. Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) were used to characterize the coating surface morphology, structure and composition. A Quartz Crystal Microbalance (QCM) was used for studying film growth kinetics on thin films of pure Fe, Al and Zn. Electrochemical Impedance Spectroscopy (EIS) was performed on treated and painted steel for studying long-term corrosion performance of the coatings. The phosphate-free coating provided long-term corrosion performance comparable to that of phosphate conversion coatings. The coatings uniformly cover the surface in the form of 10–20 nm sized nodules and clusters of these features up to 500 nm in size. The coatings are usually about 20–30 nm thick and are mostly composed of Zr and O with enrichment of copper at randomly distributed locations and clusters.

We also recommend Trading Suppliers and Manufacturers of Hexafluorozirconic acid (cas 12021-95-3). Pls Click Website Link as below: cas 12021-95-3 suppliers

Prev:Synthesis and characterization of Hexafluorozirconic acid (cas 12021-95-3) powder and its application in nanoceramic coating
Next:A comprehensive study of the green Hexafluorozirconic acid (cas 12021-95-3)-based conversion coating)