Expanite surface hardening replaces hard chrome plating

07 October 2019

Expanite, the surface hardening specialist replaces hard chrome plating at LIAG® LÄUFER INTERNATIONAL AG and solves abrasive wear and corrosion challenges in the field.

LIAG® LÄUFER is a specialist in hygienic shutter valves and pigging systems. The products are designed to meet the highest safety demands in the food industry and must withstand significant abrasive wear and corrosion aggressive environment. Their stainless steel cones were originally specified with hard chrome plating. Due to the potential health risks however, hard chrome plating is increasingly prohibited in the food industry. LIAG® LÄUFER needed to find an alternative. In their attempt to solve these challenges LIAG® LÄUFER tried different surface hardening solutions, which all failed, including a commonly used carburizing process, which caused corrosion after short time in use.

LIAG® LÄUFER finally tested Expanite and found a hardening solution that effectively reduces wear and galling, and at the same time improves the corrosion resistance of the parts.

LIAG® LÄUFER is determined to offer environmentally sustainable solutions to comply with the industry demand to exclude chrome in the food industry. Expanite hardening solution is a diffusion-based process and therefore significantly more environmentally friendly and sustainable compared to other hardening methods.

The patented Expanite process doesn’t add anything to the material (besides nitrogen and carbon), it just makes the surface harder as much as 10 times harder.