Overview
ISO 22462:2020 - "Metallic and other inorganic coatings - Test method for the friction coefficient measurement of chemical conversion coatings" defines a standardized laboratory method to measure the sliding friction coefficient of chemical conversion coated sheet and coiled products. The standard is applicable when comparing friction properties of hot‑dip galvanized, lubricated and resin‑coated steel sheet under controlled, repeatable conditions.
Key topics and technical requirements
- Scope: Friction coefficient measurement for chemical conversion coatings on sheet/coil products; comparisons require identical test conditions.
- Apparatus: A sled type tester with table, sled, clamp, stopper, test piece holder, friction block, load cell, pressure device and horizontal/vertical drives. The friction block has a curved edge to prevent tilting.
- Test pieces & preparation:
- Dimensioned specimens cut transverse or longitudinal (test direction recorded).
- Surface cleaning per ISO 27831‑1; contaminants removed and uniform pressure verified.
- Test conditions:
- Ambient: (23 ± 10) °C and (50 ± 10) % RH.
- Normal loads: typical values 300 N, 600 N, 1 800 N (select per material strength to avoid deformation).
- Sliding velocity: 0.2 m/min.
- Travel distance: sufficient to reach equilibrium friction (default example 0.1 m).
- Friction block: material (e.g., X153CrMoV12), coating (e.g., CrN), roughness (Ra 0.1 µm) and contact area must be specified.
- Lubrication: base oil; example viscosities and oiling amounts (e.g., 2 000 mg/m²) are provided; amount of lubricant should be measured if variable.
- Procedure & data:
- Record friction and normal forces; compute coefficient μ = F/N.
- Repeat tests at least five times and exclude the first run when averaging.
- Report full test parameters, measurement range, deviations and observed anomalies.
Applications and users
ISO 22462:2020 is used for:
- Quality control and product benchmarking by steel manufacturers, galvanizers and coating suppliers.
- Process development teams evaluating lubricants, conversion coatings and surface treatments for forming operations.
- Automotive, appliance and construction industries where forming behavior depends on surface friction.
- Independent test laboratories performing standardized friction testing and materials comparison.
Related standards
- ISO 377 (sample preparation and test piece location)
- ISO 27831‑1 (cleaning and preparation of ferrous metal surfaces)
- IEC 60648 (coefficients of friction test methods for films and sheeting)
Using ISO 22462:2020 helps ensure reproducible, comparable friction data for coatings - essential when optimizing forming processes, selecting lubricants or specifying coated steel products.