ISO 26146:2025 PDF

Name: ISO 26146:2025 — Corrosion of metals and alloys — Method for metallographic examination of samples after exposure to high-temperature corrosive environments
SKU: ISO 26146:2025
Price: 25 EUR
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Corrosion of metals and alloys — Method for metallographic examination of samples after exposure to high-temperature corrosive environments

Название (английский):

ISO 26146:2025

Corrosion of metals and alloys — Method for metallographic examination of samples after exposure to high-temperature corrosive environments

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 3 июня 2025 г.
Издание:: ISO IS 26146 edition 2 version 1
ICS:: 77.060

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Описание (английский):

This document specifies the examination of samples that have been exposed to corrosive environments at high temperatures. This document specifies the classification, identification and thickness measurement of the corrosion layer that forms during exposure to corrosive environments at high temperatures.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 26146:2025 - "Corrosion of metals and alloys - Method for metallographic examination of samples after exposure to high‑temperature corrosive environments" - defines a standardized metallographic procedure to classify, identify and measure corrosion layers formed during high‑temperature exposure. It covers sample preparation, cross‑sectioning, mounting, grinding/polishing, microscopic examination and thickness measurement of corrosion scales and related features.

Key topics and technical requirements

Scope: Examination of samples exposed to high‑temperature corrosive environments; classification, identification and thickness measurement of corrosion layers.

Terminology: Defines terms such as interdiffusion zone, outward/inward growing scale, external/internal scale, de‑alloyed zone, metal loss and defects (voids/cracks in corrosion layers).

Measurement accuracy: Uncertainty at 95% confidence of ±5 µm or 5% of measured material loss (whichever is lesser). Measurement systems should be calibrated and traceable; precision of the measurement system target is ±1 µm.

Microscopy and imaging: Use of metallographic optical microscopes with X–Y stages (typical magnifications ×100, ×400, ×1 000); digital microscopes with automatic X–Y stages and image analysis software are supported for stitching, measurement and evaluation.

Specimen types & preparation: Typical geometries - rod, disc, block. Detailed procedures for sectioning, mounting (e.g., epoxy with vacuum impregnation to avoid gaps), grinding/polishing sequences (P100 → P1200, optional 1 µm diamond paste, colloidal silica) to preserve edge retention of corrosion layers. Overplating and specimen supports are permitted to minimize artefacts.

Classification & evaluation: Methods to classify corrosion layers (external vs internal, grain‑boundary corrosion, de‑alloyed zones), identify layer composition and measure thickness and metal loss. Procedures include assessment of defects in layers.

Quality control: Calibration against length standards at intervals ≤ 12 months; checks against secondary standards at start/end of measurement series.

Practical applications

Quality control and acceptance testing of high‑temperature coatings, protective alloys and components used in power generation, petrochemical, aerospace and materials research.

Failure analysis and root‑cause investigations of high‑temperature corrosion damage.

Comparative testing of coatings/deposits (salts, ashes, molten metals) and evaluation of interdiffusion or internal corrosion beneath scales.

Research labs and R&D assessing new alloys or protective systems under simulated service atmospheres.

Who should use this standard

Corrosion engineers, metallurgists and materials scientists

Testing and inspection laboratories conducting metallography after high‑temperature exposures

OEMs and manufacturers of high‑temperature components and coatings

Failure analysts and standards bodies specifying test and reporting requirements

Related standards

ISO 8044 - Corrosion of metals and alloys - Vocabulary

ISO 3611 and ISO 13385‑1 - Dimensional measuring equipment (micrometers, calipers)

Keywords: ISO 26146:2025, metallographic examination, high‑temperature corrosion, corrosion layer thickness, corrosion of metals, digital microscope, image analysis.

ISO 26146:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Технические детали

SIST EN ISO 8044:2025

Corrosion of metals and alloys - Vocabulary (ISO 8044:2024)

SIST EN ISO 3611:2023

Geometrical product specifications (GPS) - Dimensional measuring equipment - Design and metrological characte…

SIST EN ISO 13385-1:2019

Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 1: Design and metrological…