Entrapment of Hard Particles into Cr(VI)-Free Conversion Layers of Electrodeposited Zinc Coatings to Improve Corrosion Resistance

Pierre Jehl; Bernd Halbedel; Marianne Lerp; Udo Schmidt; Gerd Teichert; Frank Schlütter

doi:10.4028/www.scientific.net/KEM.742.434

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 742Entrapment of Hard Particles into Cr(VI)-Free...

Entrapment of Hard Particles into Cr(VI)-Free Conversion Layers of Electrodeposited Zinc Coatings to Improve Corrosion Resistance

Abstract:

Due to the restriction of passive layers containing Cr⁶⁺ [1], which were characterized by excellent corrosion protection due to their self-healing effect for scratches on metal surfaces, current corrosion protection systems consist of chromium (III) -containing thick layer passivation. Due to their lower hardness, current corrosion protection systems are susceptible to mechanical stress. This is particularly critical at barrel plating of screws, rivets etc. where the manufacturing process leads to damages of the corrosion protection layer and consequently to reduced corrosion resistance.To counter this problem, we point out one approach to install hard particles into the passivation layer. The entrapment of the hard particles into the passivation is detected by Glow Discharge Optical Emission Spectrometry. Comparative investigations in the corrosion chamber prove the improvement of the corrosion protection of steel parts with passivation layers containing hard particles.

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Periodical:

Key Engineering Materials (Volume 742)

Pages:

434-439

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.742.434

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Online since:

July 2017

Authors:

Pierre Jehl*, Bernd Halbedel, Marianne Lerp, Udo Schmidt, Gerd Teichert, Frank Schlütter

Keywords:

Corrosion Resistance, Particle, Passivation, Suspension, Zinc Coating

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