Overview
ISO 22553-10:2022 specifies a laboratory test method to evaluate edge protection provided by electro-deposition coatings (e-coat) against corrosion of edges and stamping burrs. The standard is intended for automotive and other general industrial applications (e.g., chiller units, radiators, consumer products, aerospace, agriculture) and defines how to coat test panels, carry out corrosion exposure, and assess corrosion at hole edges.
Key topics and requirements
- Scope and purpose: Test method for evaluating protection of edges and stamping burrs by electro-deposition coatings.
- Principle: Deposit e-coat on test panels with defined holes and assess corrosion behaviour at the hole edges.
- Test panels: Electrically conductive panels ~190 mm × 105 mm × 0.75 mm with five stamped holes (20 mm diameter) and a stamping burr ~90°; the burr side must be marked.
- Apparatus: Laboratory deposition tank with circulation and DC supply, film-thickness gauge (max error 0.1 µm), accurate thermometer, and oven (controlled stoving temperature).
- Coating procedure: Homogenize bath, select deposition voltage/time to achieve specified dry film thickness, rinse with demineralized water (ISO 23321), and stove per product specification (object temperature measured).
- Corrosion exposure: Use an agreed corrosion test, for example ISO 11997-1 Method B, ISO 11997-3, or ISO 9227 (salt spray). Results vary with the selected test.
- Evaluation and rating: Visual assessment per ISO 13076 and defect designation according to ISO 4628-1. Edge corrosion is rated 0–5 (0 = no rust; 5 = >¾ edges rusted). For each panel disregard the two best and two worst hole ratings, use the median per panel, then report the mean of three panels.
- Reporting and marking: Test report must include bath voltage/temp, deposition times, stoving, film thickness, corrosion test used and measured ratings. Products can be marked, e.g., “Tested in accordance with ISO 22553-10, Rating 1”.
Applications and users
ISO 22553-10 is useful for:
- Automotive OEMs and tier suppliers for validating e-coat edge corrosion resistance.
- Coating formulators and process engineers optimizing bath parameters and stoving.
- Independent test laboratories performing quality control and compliance testing.
- Corrosion engineers assessing edge protection for industrial and consumer metal components.
Benefits include consistent, reproducible evaluation of edge protection, support for product development, supplier claims, and quality assurance.
Related standards
Normative references cited include: ISO 1514, ISO 2808, ISO 4618, ISO 4628-1, ISO 9227, ISO 11997-1, ISO 11997-3, ISO 13076, ISO 22553-1 and ISO 23321. These standards govern panels, film-thickness measurement, terminology, visual assessment, and corrosion exposure methods.
