ISO 22858:2020

Name: ISO 22858:2020 — Corrosion of metals and alloys — Electrochemical measurements — Test method for monitoring atmospheric corrosion
SKU: ISO 22858:2020
Price: 25 EUR
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Corrosion of metals and alloys — Electrochemical measurements — Test method for monitoring atmospheric corrosion

Название (английский):

ISO 22858:2020

Corrosion of metals and alloys — Electrochemical measurements — Test method for monitoring atmospheric corrosion

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 21
Дата публикации:: 17 августа 2020 г.
Издание:: ISO IS 22858 edition 1 version 1
ICS:: 77.060

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Описание (английский):

This document specifies a test method for atmospheric corrosion measurements, using two-electrode electrochemical sensors. It is applicable to measurements of the corrosion rate of uncoupled metal surfaces (i.e. "free" corrosion rate), galvanic corrosion rate, conductance of thin film solutions and barrier properties of organic coatings. It specifies electrochemical sensors that are used with or without organic coatings. The sensors are applicable to corrosion measurements made in laboratory test chambers, outdoor exposure sites and service environments.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 22858:2020 - "Corrosion of metals and alloys - Electrochemical measurements - Test method for monitoring atmospheric corrosion" defines a standardized test method using two-electrode electrochemical sensors to monitor atmospheric corrosion. The standard covers measurement of the free (uncoupled) corrosion rate, galvanic corrosion rate, conductance of thin film solutions, and barrier properties of organic coatings. Sensors described can be used with or without coatings, and are suitable for laboratory test chambers, outdoor exposure sites and in-service environments.

Key topics and requirements

Sensor types and geometry

Free corrosion current sensors
Galvanic corrosion current sensors
Thin-film conductance sensors
Coating barrier property sensors

Measurement methods

Free corrosion: sine-wave, triangle-wave and potential-step excitation methods for uniform corrosion; procedures for localized corrosion
Galvanic corrosion: zero-resistance ammeter and precision-resistor methods
Surface conductance and coating barrier measurements using two-electrode techniques

Output metrics

Corrosion current and current density, corrosion penetration and mass loss rates, total charge for coated sensors, and conductance of thin films

Preparation and verification

Surface preparation considerations for sensors with and without coatings
Specification and inspection requirements: visual checks, span/range verification, electrical tests and corrosion verification tests

Test execution and reporting

Guidance on atmospheric test types, test arrangement, sampling intervals, duration, sensor selection and data storage
Test report content and example reporting information

Supporting information

Informative annexes with example sensor images, equivalent circuit analysis for two-electrode measurements, reporting examples and bibliography

Applications

ISO 22858:2020 is designed for real-time, continuous monitoring of atmospheric corrosion where instantaneous electrochemical data are required. Practical applications include:

Evaluating corrosion performance of metals and alloys in atmospheric exposure testing

Assessing galvanic interactions between dissimilar materials

Monitoring thin-film electrolyte conductance (e.g., salt films, condensation)

Testing coating barrier performance and early detection of coating breakdown

Laboratory R&D, outdoor exposure sites, plant/infrastructure asset condition monitoring and life‑cycle assessment

Related standards

ISO 8407 (mass loss corrosion testing methods)

ISO 4628-8 (evaluation of degradation of coatings) These standards complement ISO 22858 when combining electrochemical monitoring with mass-loss or visual coating assessment.

Keywords: ISO 22858:2020, atmospheric corrosion, electrochemical measurements, corrosion sensors, galvanic corrosion, free corrosion current, thin-film conductance, coating barrier properties.

ISO 22858:2020

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

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