Overview
EN ISO 14924:2005 - Thermal spraying: Post‑treatment and finishing of thermally sprayed coatings - provides practical guidance for treating and finishing coatings produced by thermal spray processes. Published by CEN (adopting ISO 14924:2005), the standard covers mechanical, chemical and thermal post‑treatment methods applicable to a wide range of thermally sprayed materials and service requirements.
Key topics and requirements
- Scope: Procedures for mechanical post‑treatment (chip cutting, grinding, milling, drilling, belt finishing), chemical treatment (sealing, chemical conversion, painting) and thermal treatment (fusing, diffusion annealing, hot isostatic pressing).
- Mechanical post‑treatment:
- Tool selection and cutting strategies for thermally sprayed coatings (different microstructure and embedded hard phases require harder tool materials - e.g., hard metals and CBN for very hard coatings).
- Guidance on turning, milling, grinding and belt finishing; preferred use of wet grinding to avoid overheating and coolant penetration.
- Annexes provide estimated machining parameters (cutting speeds, feeds, depths) and recommended grinding wheels/abrasives.
- Special processes: shot peening (to densify and induce compressive stress), brushing, polishing, superfinishing for very low roughness.
- Chemical treatment:
- Sealing to close micro‑porosity - critical for hydraulic/pneumatic sealing, corrosion protection, electrical insulation, friction control (e.g., PTFE sealers) and visual/architectural finishes.
- Painting recommendations, including the importance of swift application over Zn/Al coatings (referenced EN ISO 2063 and EN ISO 12944‑5).
- Chemical conversion and color treatment for visual/aesthetic purposes.
- Thermal treatment:
- Fusing of self‑fluxing alloys (see EN ISO 14920), diffusion annealing to improve bond strength (requires controlled atmosphere or vacuum), and hot isostatic pressing to increase density and adhesion.
- Health & safety: Follow applicable protective, labour and environmental guidelines for each process.
Practical applications and users
- Intended for: coating engineers, surface treatment specialists, manufacturing engineers, maintenance teams, OEMs, quality managers and specifiers.
- Typical uses: restoring worn machine components, creating corrosion‑resistant surfaces, producing functional seals, improving tribological properties, and preparing components for final machining or painting.
- Benefits: helps select appropriate finishing methods, tooling and process controls to avoid coating damage, contamination or premature failure.
Related standards
- EN ISO 2063 - Thermal spraying: Zn, Al and alloys
- EN ISO 14920 - Spraying and fusing of self‑fluxing alloys
- EN ISO 12944‑5 - Protective paint systems for corrosion protection
- ISO 504 - Designation/marking for carbide turning tools
Keywords: EN ISO 14924, thermal spraying standard, post‑treatment, thermally sprayed coatings, chip cutting, sealing, fusing, diffusion annealing, hot isostatic pressing, grinding, surface treatment.
