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Optimize Metals Pretreatment with Chromium-free Conversion Coating

    June 27, 2018

Achieving the best surface for multi-metal bonding is a challenge for automakers and suppliers. Body structures, as well as engine and drivetrain system components, contain a combination of materials, including aluminum, steel, magnesium or compacted graphite iron, to name a few.

The unique properties of each metal come into play when preparing the substrates for improved bonding performance. Use of conversion coatings is key to stabilizing substrate surfaces and achieving the highest level of adhesion.

Learn more about improving adhesion capabilities here

While plasma coating is used as a surface modification technique to prepare metals surfaces for improved bonding it does have limits. For example, in some cases consistency of the substrate conditions may show variability in performance. Plasma’s operational window requires sequential application of treatment to allow adhesion to be successful.

In contrast, Henkel’s BONDERITE® line of thin-film, conversion coating chemically treat metal substrates by forming a uniform oxide layer for improved adhesive bonding. These coatings dramatically enhance the adhesion of formed-in-place liquid gaskets and are highly effective in providing improved sealing characteristics when applied to the mix of lightweight metals used in today’s vehicles. Additionally, these coating can be used for multiple applications including, engine covers, oil pans, seal retainers, transmission cases, covers, and axle covers.

BONDERITE thin-film conversion coatings:

  • Increase liquid gasket adhesion by up to 4x’s times
  • Decreases leak rates on sealing applications
  • Cost effective alternative to plasma applications
  • Bonding performance can remain present for weeks after application
  • ROHS compliant technology

Both BONDERITE® M-NT 5700™ and BONDERITE® M-NT 1455™ technologies can either be manually or robotically applied, and the surface ready for bonding in seconds following the application.

Watch our previously recorded webinar on Improving Adhesion Capabilities through the use of Conversion Coatings to learn more about how conversion coating stabilizes the surface of substrates to provide the best possible adhesion.

About the Author, Kerry Ankenbrand

Kerry Ankenbrand is the North American Surface Treatment Business Development Manager for the ACS group with Henkel Corporation. Since his appointment in October 2016, he is responsible for Business Development of both Surface Treatment and Ecoat technologies. Ankenbrand has over 20 years of experience in automotive and has been with Henkel since 2006. For the last 12 years, he was Business Development Specialist for the MPP coating technology and also played an integral role during the design and launch of the F-150 aluminum platform. Ankenbrand has degrees in Business Management and Political Science from the University of Southern Indiana and an MBA of Technical Management from the University of Phoenix.

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