Zinc Primers Tout Crack Self-Healing


Hempel has announced a portfolio of three new anti-corrosive zinc primers developed for a wide range of industries and applications, from offshore oil and gas to wind turbines.

Hempadur AvantGuard activated zinc primers use hollow glass spheres and a proprietary activator to activate more of the zinc in the coating for a higher galvanic effect, stopping micro-cracks as they form, the company say

The product line consists of AvantGuard 770, 750 and 550.

'Self-Healing' Process

According to Hempel, the technology was developed after discovering that only one-third of the zinc in a zinc epoxy primer is utilized for galvanic protection.

The coating's formulation improves its mechanical strength, which is an important feature for applications with extreme temperature and humidity fluctuations, the company says.

"In a standard zinc epoxy protective system, the zinc primer is the weakest mechanical point and, as a result, cracks can form in the coating as the steel expands and contracts under extreme conditions," says Josep Palasi, Hempel R&D Director.

Palasi explains that the coatings "are different as the glass spheres and sub-products that result from the unique zinc activation process stop micro-cracks as soon as they form. This, we can say, makes the coating self-healing."


According to the company, the zinc activation process stops micro-cracks "as soon as they form," making the coating "self-healing."

The primers can be applied using the same methods as standard zinc epoxies.

More information: www.hempel.com.


Tagged categories: Coating Application; Corrosion protection; EMEA (Europe, Middle East and Africa); Hempel; North America; Oil and Gas; Primers; Wind Towers; Zinc

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