ISO 8289-2:2019 PDF

Vitreous and porcelain enamels — Low-voltage test for detecting and locating defects — Part 2: Slurry test for profiled surfaces

Название (английский):

ISO 8289-2:2019

Vitreous and porcelain enamels — Low-voltage test for detecting and locating defects — Part 2: Slurry test for profiled surfaces

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 20 марта 2019 г.
Издание:: ISO IS 8289 edition 1 version 1
ICS:: 25.220.50

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Описание (английский):

This document specifies a low-voltage test method for detecting and locating defects (pores, cracks or pop-offs) that occur in enamel coatings of corrugated and/or undulated profiles and that extend down to the metal base. The method is based on colour effects (optical method) and is applicable to the precise detection of defects and their exact position. It can be used for non-flat, more profiled shapes such as corrugated or undulated surfaces. NOTE The low-voltage test is a non-destructive test for detecting defects extending down to the metal base and is, therefore, completely different in comparison to the high-voltage test in accordance with ISO 2746.

Технические детали

Технический комитет: ISO/TC 107 - Metallic and other inorganic coatings
SKU: ISO 8289-2:2019

Abstract

Overview

ISO 8289-2:2019 specifies a low-voltage slurry (barbotine) test to detect and locate defects - pores, cracks or pop-offs - in vitreous and porcelain enamel coatings applied to corrugated or undulated (profiled) metal surfaces. The method is an optical, non-destructive low-voltage test that uses a conductive slurry and colour effects to indicate defects that extend down to the metal base.

The test is particularly suited to non-flat shapes (corrugated sheets, undulated profiles) where precise position mapping of defects is required.

Key Topics

Principle: defects are revealed optically when a conducting slurry makes electrical contact between a positive electrode and exposed metal at the defect; a visible colour change (red spots in the slurry) marks each defect.
Test medium: a sprayable, thixotropic slurry based on titanium dioxide, polysaccharide, pyrogenic silicic acid, quartz powder and an alcoholic phenolphthalein solution in a sodium chloride electrolyte. Typical slurry preparation details and proportions are given in the standard.
Electrical parameters: the method uses a DC power source adjustable within approximately 10 V to 24 V; the routine test setting in the standard is 12 V for 1 minute.
Solution characteristics: the test solution should have a conductivity of approximately 0.475 S/m (±0.025) and a pH ≈ 8 (±0.5). Sodium nitrite may be used as an alternative electrolyte when post-test re-enamelling is planned.
Evaluation: defects are counted and reported as a number per unit area using N = S / A, where S is the number of defects detected and A is the test area in square metres.

Applications

Quality control on enamelled heat-exchanger sheets, regenerative heat-exchanger components and other corrugated/undulated enamelled metal products.
Incoming inspection, production-line spot checks and failure analysis where precise defect location and mapping are required without damaging the part.
Useful for manufacturers, coating process engineers, QA laboratories and maintenance teams who need a repeatable, interpretable optical indication of coating breaches to the metal base.

Practical advantages:

Non-destructive detection of defects that extend to the metal base

Abstract

Overview

The test is particularly suited to non-flat shapes (corrugated sheets, undulated profiles) where precise position mapping of defects is required.

Key Topics

Principle: defects are revealed optically when a conducting slurry makes electrical contact between a positive electrode and exposed metal at the defect; a visible colour change (red spots in the slurry) marks each defect.
Test medium: a sprayable, thixotropic slurry based on titanium dioxide, polysaccharide, pyrogenic silicic acid, quartz powder and an alcoholic phenolphthalein solution in a sodium chloride electrolyte. Typical slurry preparation details and proportions are given in the standard.
Electrical parameters: the method uses a DC power source adjustable within approximately 10 V to 24 V; the routine test setting in the standard is 12 V for 1 minute.
Solution characteristics: the test solution should have a conductivity of approximately 0.475 S/m (±0.025) and a pH ≈ 8 (±0.5). Sodium nitrite may be used as an alternative electrolyte when post-test re-enamelling is planned.
Evaluation: defects are counted and reported as a number per unit area using N = S / A, where S is the number of defects detected and A is the test area in square metres.

Applications

Quality control on enamelled heat-exchanger sheets, regenerative heat-exchanger components and other corrugated/undulated enamelled metal products.
Incoming inspection, production-line spot checks and failure analysis where precise defect location and mapping are required without damaging the part.
Useful for manufacturers, coating process engineers, QA laboratories and maintenance teams who need a repeatable, interpretable optical indication of coating breaches to the metal base.

Practical advantages:

Non-destructive detection of defects that extend to the metal base

ISO 8289-2:2019 PDF

Технические детали

Abstract

Overview

Key Topics

Applications

Abstract

Overview

Key Topics

Applications

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