Coating Adhesion & Bond Test

Posted by Hardide 30 July, 2025

The adhesive properties and bond strength of Hardide coatings have surpassed the independent ASTM C633 test.

The ability of any surface coating to adhere to the coated substrate is of utmost importance to avoid component failure, repairs and downtime.

Independent ASTM C633-01 testing has shown that the adhesion bond strength of the Hardide coating is greater than 70 MPa or 10,000 psi (adhesive glue can separate at lower rates).

The images below illustrate the coating’s ability to survive impact, significant substrate deformations and shock loads without spalling or cracking.

Impact Resistant – 1mm diameter indentation from impact
Scratch Test – 50 microns thick Hardide-T coating on steel

4140 steel test ring with Hardide coating

A steel test ring with 50 microns of Hardide coating was crushed to test coating adhesion and toughness.

The crushed test ring showed no flaking or coating separation from the substrate.
The Hardide coating retained integrity at the flat side of the ring despite significant deformations.
The Hardide coating cracked only where the substrate cracked at the crushed end of the ring.