ISO 22553-3:2019

Overview

ISO 22553-3:2019 defines a laboratory test method to determine the compatibility of electro‑deposition (e‑coat) coating materials with a reference oil. The standard is focused on detecting surface defects caused by surface‑active contaminants (oils and lubricants) that can enter e‑coat baths during production. It is applicable to e‑coats used in the automotive sector and other general industrial applications (chillers, consumer products, radiators, aerospace, agriculture).

Key topics and technical requirements

• Test principle: Coat standard conductive panels with the e‑coat, contaminate the bath with a defined reference oil preparation, deposit coated panels, cure (etch/oven) and evaluate visually for surface defects (craters, streaks).
• Reagents and mixture: Uses butyl glycol and a specified reference oil; the procedure mixes 10 ml reference oil with 90 ml butyl glycol, then adds 2.5 ml of that mixture to 5 l of e‑coat for the contaminated test.
• Apparatus: Laboratory deposition system with tank, recirculation and DC supply; 5 l container; dry film thickness gauge (max error 0.1 µm); thermometer (0.1 °C); stopwatch; pipette (1 µl); oven capable of maintaining temperature within specified tolerances.
• Test panels: Electroconductive pretreated panels ~190 mm × 105 mm × 0.75 mm (per ISO 1514).
• Procedure details: Includes a blank (uncontaminated) test and contaminated tests, homogenization (e.g., 24 h mixing), deposition parameters selected to achieve nominal dry film thickness, rinsing per ISO 23321, and curing/oven conditions per product specification.
• Evaluation and acceptance: Visual examination per ISO 13076; record number of craters per 10 cm × 10 cm and measure dry film thickness per ISO 2808.
• Reproducibility: Determination performed in triplicate; reporting requirements list detailed test conditions and observations.

Practical applications

• Screening e‑coat formulations for sensitivity to oils, lubricants and surface‑active contaminants.
• Verifying bath robustness after process changes (new lubricants, corrosion‑protection oils, forming aids).
• Quality control and troubleshooting in automotive finishing lines and industrial coating shops.
• Supporting supplier and OEM specifications for e‑coat performance in contaminated production environments.

Who should use this standard

• Paint and varnish formulators and R&D teams
• Coating suppliers and contract coaters
• Automotive OEMs and tier‑1 finishing engineers
• Independent testing laboratories and quality control personnel

Related standards

• ISO 22553‑1 (vocabulary for e‑coat)
• ISO 22553‑4 (compatibility with liquid/pasty/solid contaminants)
• ISO 13076 (visual assessment of coatings)
• ISO 2808 (dry film thickness measurement)
• ISO 1514 and ISO 23321 (test panels and rinse water)

Keywords: ISO 22553-3:2019, electro-deposition coatings, e-coat compatibility, reference oil test method, paints and varnishes, automotive coating quality.