Exceptional corrosion protection
in bare-film and pre-paint applications
Outstanding adhesion characteristics
for paints and adhesives
Optimized operating cost
Highly concentrated and low consumption ensure lowest cost of ownership
- Cr(III)/Zr?based conversion coating ideal for aluminum and light metal applications
- Two?component system enabling adjustable operation for optimized performance
- Excellent bare film corrosion resistance
- Compatibility with e?coat, powder, and liquid paint systems
- Strong adhesion for paints and adhesives, including structural bonding
- Effective on primary and recycled aluminum alloys (cast, stamped, forged)
- Low volume/contact resistance capability
- OEM approved and REACH, RoHS, and ELV compliant
Interlox 377 offers best-in-class performance for aluminum surface finishing pre?paint treatment or final passivate. It is suitable for a wide range of industrial and high?performance applications, including:
- Automotive structural and underbody components
- Electric vehicle battery housings, modules, and cells
- Thermal management systems
- Aluminum fasteners
- Architectural aluminum
- Other industrial aluminum passivation applications
Interlox 377
Future ready corrosion protection for demanding aluminum applications
Interlox 377 is an advanced Cr(III)/Zr conversion coating engineered to deliver reliable corrosion protection and adhesion across today¡¯s increasingly complex aluminum substrates. The process forms a thin, inorganic coating layer based on zirconium and chromium oxides that uniformly covers the aluminum surface, providing effective passivation while maintaining excellent compatibility with downstream joining and coating operations.
Its unique coating structure enhances resistance to general corrosion, galvanic corrosion in mixed metal assemblies, and crevice corrosion ? critical for modern automotive and electric vehicle components. Interlox 377 performs equally well as a standalone passivation and as a pre paint treatment, supporting e coat, powder, and liquid paint systems without compromising adhesion or coating integrity. Designed for sustainability and operational efficiency, the highly concentrated, ambient temperature operation, and low sludge formulation supports extended bath life while reducing energy consumption, maintenance requirements, and overall process costs. Interlox 377 therefore enables manufacturers to achieve high performance, regulatory compliance, and cost efficiency within a single, adaptable coating platform.
What inspires us
Why we developed Interlox 377
Your challenge
Modern aluminum components face a unique combination of challenges. Increasing use of recycled alloys introduces greater alloy variability and impurity levels, while complex geometries such as structural castings and battery housings demand consistent protection across the entire surface. At the same time, OEMs require excellent corrosion resistance, strong paint and adhesive adhesion, and full regulatory compliance¡ªoften under tight cost and energy constraints. Conventional zirconium or legacy chromium systems can struggle to balance these requirements across diverse applications.
Our solution
Interlox 377 was engineered to address these challenges holistically. Its Cr(III)/Zr chemistry forms a uniform, inorganic conversion layer that delivers reliable corrosion resistance, excellent adhesion, and strong performance on both primary and recycled aluminum alloys. The wide operating window and low maintenance formulation ensure process stability and adaptability across different line configurations and component types. As a result, Interlox 377 enables manufacturers to meet today¡¯s demanding performance standards ? while advancing sustainability goals and reducing total cost of ownership.
