Optimize Metals Pretreatment with Chromium-free Conversion Coating
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.
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
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.