SIST EN ISO 28706-5:2012 PDF

Name: SIST EN ISO 28706-5:2012 — Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 5: Determination of resistance to chemical corrosion in closed systems (ISO 28706-5:2010)
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Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 5: Determination of resistance to chemical corrosion in closed systems (ISO 28706-5:2010)

Название (английский):

SIST EN ISO 28706-5:2012

Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 5: Determination of resistance to chemical corrosion in closed systems (ISO 28706-5:2010)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 20
Дата публикации:: 23 ноября 2011 г.
ICS:: 25.220.50
Технический комитет:: IPKZ - Protection of metals against corrosion

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Описание (английский):

ISO 28706-5:2010 specifies a test method for the determination of the resistance of vitreous- and porcelain-enamelled articles to attack in closed systems by acid, neutral and alkaline liquids, as well as by actual process mixes. It applies primarily to the testing of enamels designed for use in chemical processes.

Abstract

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Упомянутые в описании и другие стандарты SIST

Overview

EN ISO 28706-5:2011 (ISO 28706-5:2010) defines a laboratory test method for determining the resistance of vitreous and porcelain enamels to chemical corrosion in closed systems. It is intended primarily for enamels used in chemical-process environments where liquids act on enamel surfaces under closed/high-temperature conditions (autoclaves). The standard supersedes EN 14483-5:2004 and is part of the ISO 28706 series on corrosion testing of enamels.

Key Topics

Scope and principle: assessment of enamel dissolution by acids, neutrals and alkalis in closed systems; attack is quantified by mass loss and, where appropriate, corrosion rate.

Apparatus and autoclave testing: test equipment and autoclave procedures for high-temperature, pressurized exposure to aggressive media to avoid inhibition effects.

Test specimens and preparation: specimen selection, surface preparation and area measurement requirements.

Test procedures: specified exposure conditions (including a short high-temperature autoclave regime-typically limited to 24 h to avoid inhibition), liquid-to-surface ratios and solution preparation with low‑silica water when required.

Specific tests:

Autoclave test with hydrochloric acid (example of linear attack enabling corrosion-rate calculation).
Test with hot sodium hydroxide solution (alkaline attack behaviour).
Simulated solutions and actual process fluids (customized testing using process mixes representative of service conditions).

Expression of results: loss in mass per unit area (g/m2) and, when attack is linear, rate of loss in mass per unit area and corrosion rate (mm/year).

Limitations and notes: different firing temperatures (e.g., enamels fired below 700 °C) may require alternative test parameters; safety warning about hazardous chemicals and procedures.

Applications

Material selection and qualification for chemical‑process equipment (reactors, tanks, heat exchangers) lined with vitreous or porcelain enamel.

Quality control and batch acceptance testing by enamel manufacturers and coating suppliers.

Independent laboratory testing, failure analysis and verification for plant operators, OEMs and specifiers.

R&D for new enamel formulations and process compatibility assessments with real process fluids.

Related Standards

Other parts of ISO 28706 (Parts 1–4) covering room‑temperature acids, boiling acids/neutrals, and alkaline tests using various vessel geometries.

EN 14483-5:2004 (superseded)

Keywords: EN ISO 28706-5:2011, vitreous and porcelain enamels, chemical corrosion, closed systems, autoclave test, corrosion resistance testing, hydrochloric acid, sodium hydroxide, process fluids.

SIST EN ISO 28706-5:2012 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Who Uses This Standard

Related Standards

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