ISO 21227-3:2007 PDF

Name: ISO 21227-3:2007 — Paints and varnishes — Evaluation of defects on coated surfaces using optical imaging — Part 3: Evaluation of delamination and corrosion around a scribe
SKU: ISO 21227-3:2007
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Paints and varnishes — Evaluation of defects on coated surfaces using optical imaging — Part 3: Evaluation of delamination and corrosion around a scribe

Название (английский):

ISO 21227-3:2007

Paints and varnishes — Evaluation of defects on coated surfaces using optical imaging — Part 3: Evaluation of delamination and corrosion around a scribe

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 23 марта 2007 г.
Издание:: ISO IS 21227 edition 1 version 1
ICS:: 87.040

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Описание (английский):

ISO 21227-3:2007 specifies a method for evaluating delamination and corrosion around a scribe by means of digital optical imaging. The damaged surface can be produced in accordance with ISO 9227, ISO 11997-1 or ISO 11997-2.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21227-3:2007 - Paints and varnishes - Evaluation of defects on coated surfaces using optical imaging - Part 3: Evaluation of delamination and corrosion around a scribe - specifies a digital optical imaging method to quantify delamination and corrosion adjacent to a scribe (artificial scratch). The damaged surface may be produced using standard corrosion tests (ISO 9227, ISO 11997-1, ISO 11997-2). The method converts images to greyscale or binary format to measure damaged area, mean and maximum widths, and shape of the affected zone.

Key topics and technical requirements

Digital optical imaging: Capture of the scribed area using calibrated imaging equipment; image processing (thresholding) to separate damaged vs. undamaged regions.

Illumination: Choose diffused reflection for stripped/coated corrosion and directional reflection for low-contrast delamination to clearly distinguish defect zones.

Resolution: Minimum imaging resolution of 6 pixels per millimetre; deviations must be reported.

Calibration: Scale calibration in X and Y (e.g., graph paper or pictorial standards) so pixel counts map to millimetres for accurate area/width measurements.

Quantitative evaluation:

Determine evaluated areas (scribe area, delaminated area, corroded area) and the evaluated scribe length.
Compute mean widths (and optionally maximum widths) of delamination/corrosion perpendicular to the scribe.
Map measured mean widths to the numerical rating (0–5) per ISO 4628-8 for comparability with visual grading.

Precision: Interlaboratory data show average relative standard deviation ~9% for mean width by imaging (visual assessment showed higher variability).

Test report requirements: Identification of coating, reference to ISO 21227-3, imaging/illumination details, resolution, processing steps, results, deviations and tester identity/date.

Applications and practical value

Objective measurement of delamination, coating failure, and corrosion around scratches for product development, quality control, and failure analysis.

Useful in automotive, marine, offshore, infrastructure, and industrial coatings R&D where reproducible corrosion resistance data are required.

Supports correlation between accelerated corrosion tests (salt spray, cyclic corrosion) and quantified defect metrics for coating performance claims.

Enables more reproducible, quantitative assessment compared with pictorial visual methods, assisting labs in interlaboratory comparisons and process control.

Related standards

ISO 21227-1 (general guidance for optical imaging evaluation)

ISO 4628-8 (grading delamination and corrosion around a scribe)

ISO 9227, ISO 11997-1, ISO 11997-2 (corrosion test methods used to produce damage)

Keywords: ISO 21227-3, delamination, corrosion, scribe, digital optical imaging, coatings evaluation, ISO 4628-8, resolution, calibration, paint testing.

ISO 21227-3:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and practical value

Who should use this standard

Related standards

Технические детали

SIST EN ISO 9227:2023/A1:2024

Corrosion tests in artificial atmospheres - Salt spray tests - Amendment 1: Footnote of warning (ISO 9227:202…

BS EN ISO 11997-1:2026

Paints and varnishes. Determination of resistance to cyclic corrosion conditions. Wet (salt fog)/dry/humid.

SIST EN ISO 11997-2:2026

Paints and varnishes - Determination of resistance to cyclic corrosion conditions - Part 2: Wet (salt fog)/dr…

SIST EN ISO 4628-8:2014

Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, a…

SIST EN ISO 21227-3:2007

Paints and varnishes - Evaluation of defects on coated surfaces using optical imaging - Part 3: Evaluation of…

SIST EN ISO 21227-1:2004

Paints and varnishes - Evaluation of defects on coated surfaces using optical imaging - Part 1: General guida…