ISO 22553-15:2022

Overview

ISO 22553-15:2022 specifies a laboratory test method to estimate the effect of permeate residues - jetting liquids from the rinsing process after electro-deposition coating (e-coat) - on the appearance and surface integrity of electro-deposition coatings. Intended for the automotive sector and general industrial applications (e.g., chiller units, consumer products, radiators, aerospace, agriculture), the standard helps manufacturers and coating formulators assess whether rinse residues produce colour changes, edge corrosion or other visible deterioration after stoving.

Key topics and requirements

• Scope and purpose: Method for introducing small volumes of test liquids into indentations on a coated panel to simulate permeate residues and evaluate resulting changes after stoving.
• Test specimens: Electrically conductive, pre-treated panels (~190 × 105 × 0.75 mm) with six indentations (recommended 2.5 mm depth) per ISO 1514.
• Apparatus: Laboratory deposition system with tank circulation and DC supply, pipette (0.1 ml), oven (stoving temperature controlled to ±2 °C up to 150 °C), thermometer (0.1 °C accuracy), indentation tool per ISO 1520.
• Procedure highlights:
  • Deposit cathodic e-coat under controlled bath temperature and voltage to achieve nominal dry film thickness.
  • Rinse with demineralized water (ISO 23321) and dry 30 minutes.
  • Apply ~0.1 ml of each test substance into two adjacent indentations (duplicate determinations).
  • Stove the panel according to coating specifications (object temperature; typical 140–180 °C).
• Evaluation: Visual assessment versus a blank panel following ISO 13076 and ISO 4628-1; use a 0–5 rating scale to record intensity of changes and report mean values of duplicates.
• Reporting and marking: Test report must include bath voltage, temperature, deposition and stoving times, test results, deviations and observations. Results may be summarized with a designation code, e.g. “ISO 22553-15 - Rating 1”.
• Optional: Parties may agree to additional corrosion testing (e.g., ISO 11997-1, ISO 11997-3, ISO 9227).

Practical applications and users

• Who uses it: Coating formulators, automotive OEMs and suppliers, quality and R&D labs, surface-treatment contractors.
• Why it matters: Detects susceptibility of e-coats to rinse-related residues that can cause cosmetic defects or corrosion initiation; supports process optimization (rinsing, filtration, stoving) and supplier/product qualification.
• Common use cases: Pre-production screening of e-coat formulations, troubleshooting coating defects traced to rinsing/permeate, supplier quality agreements and specification compliance.

Related standards

• ISO 1514 (standard panels), ISO 1520 (indentations / cupping), ISO 13076 (visual assessment lighting/procedure), ISO 4628-1 (evaluation scale), ISO 23321 (demineralized water), ISO 11997-1 / ISO 11997-3 / ISO 9227 (corrosion tests).