Adherence measurements and corrosion resistance in primer/hot-dip galvanized steel systems

This paper focuses on the adherence during ageing of a primer (made of polyester resins crosslinked with melamine) applied onto hot-dip galvanized (HDG) steel for coil coating application and its influence on corrosion protection. A chromium-free surface treatment, composed of fluorotitanic acid, phosphoric acid, manganese phosphate, and vinylphenol was applied on the HDG steel to obtain high corrosion resistance and high adherence of a polyester and melamine primer. The influence of the manganese phosphate on the corrosion and adherence was investigated. To measure the adherence between the metal and the primer, a three-point flexure test was set up. The adherence was then linked with corrosion resistance during ageing, using electrochemical impedance spectroscopy

Atmospheric Corrosion Behavior of Zinc and Zinc Alloys

Zinc atmospheric corrosion is wellknown, and standards are available. In some applications, like gabion walls, Zn-Al alloys coatings have been proposed to protect steel wires, together with polymeric top coatings in aggressive environments. The aim of this article is to compare corrosion rates of Zn and Zn-Al coatings exposed to natural atmospheres with ISO standards prediction and accelerated tests. The corrosion rate of zinc alloys is lower than zinc, in both natural and accelerated exposure. The lack of medium-long term data in natural exposure makes it difficult to forecast actual behavior of zinc alloys, especially in more severe exposure conditions

Morphological Characterization and Corrosion Resistance of Cr III and Cr VI-Based Conversion Layers on Zinc Coatings

Questa pubblicazione fa parte della serie EFC (European Federation of Corrosion) books. Il contributo è stato sottoposto a giudizio dei referee prima di essere stato inserito nel volume

Corrosion of AISI 321 thermostat sheath in boilers employed for hot water production: a case history

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Morphological characterization and corrosion resistance of Cr III and Cr VI based conversion layers on zinc coatings.

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