úvod
ISO (Mezinárodní organizace pro normalizaci) je globální federací národních normalizačních orgánů (členy ISO). Vývoj mezinárodních norem se obvykle provádí prostřednictvím technických komisí ISO. Each member group interested in a subject for which a technical committee has been established has the right to be represented on the Committee. Mezinárodní organizace, governments and non-governmental organizations in contact with ISO are also involved in this work. ISO úzce spolupracuje s Mezinárodní elektrotechnickou komisí (IEC) ve všech záležitostech elektrické normalizace.

Část 1 Směrnice ISO/IEC popisuje postupy použité pro vývoj tohoto dokumentu a pro další údržbu. Zejména, pozornost by měla být věnována různým schvalovacím kritériím požadovaným pro různé typy dokumentů ISO. Tento dokument byl vypracován v souladu s redakčními pravidly části směrnice ISO/IEC 2 (viz iso.org/directives).

Upozorňujeme, že některé prvky tohoto dokumentu mohou být předmětem patentových práv. ISO nenese odpovědnost za identifikaci některého nebo všech takových patentů. Details of any patent rights identified during the development of the document will be found in the introduction and/or list of ISO Patent declarations received (viz iso.org/patents).

Any trade names used in this document are provided as information for the convenience of the user and do not constitute an endorsement.

ISO 22858-2020 – Electrochemical measurement of Corrosion of metals and alloys – Test method for monitoring atmospheric corrosion

Explanations of the relevant standards of voluntary, ISO specific terms related to conformity assessment and the expression of meaning, and the ISO in the technical barriers to trade (TBT) dodržovat principy světové obchodní organizace (WTO) information, please refer to the iso.org/iso/foreword.html.

This document has been prepared by the ISO/TC 156 Technical Committee on Corrosion of Metals and Alloys.

Any feedback or questions on this document should be referred to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

představit
The purpose of this document is to provide instructions on the use of electrochemical sensors to monitor atmospheric corrosion. These sensors are used for long-term measurement of thin film electrolyte conductance, corrosion current or coating condition. This method allows real-time assessment of corrosion currents associated with specific environmental conditions. Instantaneous corrosion current measurements cannot be obtained using resistance sensors or mass loss techniques. The techniques described in this document complement other standard techniques for assessing atmospheric corrosion, such as mass loss test sheets, resistance sensors or coating test plates (viz ISO 8407 a ISO 4628-8). These continuous records of material conditions can be used to study atmospheric corrosion, evaluate materials, or manage assets. [21][22][23][24][25][26][27][28][29]

ISO 22858-2020 – Electrochemical measurement of Corrosion of metals and alloys – Test method for monitoring atmospheric corrosion

This document is based on ANSI/NACE TM0416-2016.

This document is relevant to alloy and coating manufacturers as well as users in transport, chemical process, energy and infrastructure applications.

1 Rozsah aplikace
This document specifies a test method for atmospheric corrosion measurement using a two-electrode electrochemical sensor.

It is suitable for measuring the corrosion rate of uncoupled metal surfaces (tj. a “free” corrosion rate), the galvanic corrosion rate, the conductivity of film solutions and the barrier properties of organic coatings. It specifies electrochemical sensors with or without the use of organic coatings. These sensors are suitable for corrosion measurements in laboratory test rooms, outdoor exposure sites and service environments.

2 Normativní referenční dokumenty
When the following documents are referenced in the text, some or all of them constitute the requirements of this document. Pro datované odkazy, platí pouze citovaná verze. Pro nedatované citace, a new version of the referenced document (včetně případných revizí) platí.

ISO 4618, barvy a laky – termíny a definice

ISO 4628 (všechny části), barvy a laky – Posouzení degradace povlaku – designation of number and size of defects, and intensity of uniform changes in appearance

ISO 8044, Koroze kovů a slitin – Slovní zásoba

ISO 22858-2020 – Electrochemical measurement of Corrosion of metals and alloys – Test method for monitoring atmospheric corrosion

ISO 9223, Koroze kovů a slitin – corrosion of the atmosphere – classification, determination and estimation

3 termíny a definice
Pro účely tohoto dokumentu, termíny a definice uvedené v ISO 4618, ISO 4628 (všechny části), ISO 8044, ISO 9223 and the following apply.

ISO a IEC udržují terminologické databáze pro standardizaci na následujících adresách:

– ISO online browsing platform iso.org/obp

– Elektropedie IEC: k dispozici na electropedia.org/

3.1 Resistance Sensor

A device for measuring corrosion, including measuring the ratio of an electric potential difference along a conductor to the current passing through it

Article Note 1: ISO 15091:2019, 3.1 defines “resistance” as “the ratio of the potential difference along a conductor to the current passing through it.”

ISO 22858-2020 – Electrochemical measurement of Corrosion of metals and alloys – Test method for monitoring atmospheric corrosion

3.2 Electrochemical Sensor

A device for measuring corrosion involving anode and cathode reactions

Poznámka 1: ISO 8044:2020, 4.1 defines “electrochemical corrosion” as “corrosion involving at least one anode reaction and one cathode reaction”.

3.3 Number of Electrodes

Single finger of interdigital electrode (3.5)

3.4 Corrosion Penetration

The distance between the corroded surface and the original surface of the metal

Poznámka 1: ISO 8044:2020, 3.11 defines “corrosion depth” as “the distance between a point on the surface of the metal affected by corrosion and the original surface of the metal”.

3.5 Interfinger electrodes

Electronic conductors that interlock like fingers

ISO 22858-2020 – Electrochemical measurement of Corrosion of metals and alloys – Test method for monitoring atmospheric corrosion

3.6 Sensor Range

Upper and lower limit measurements

3.7 Sensor Span

The difference between the maximum and minimum measurements

3.8 Solution resistance

The ratio of the electrode potential increment to the corresponding current increment depends on the solution

3.9 Film conductance

Current transfer capacity of solution layer

Article Note 1: ISO 15091:2019, 3.3 defines “conductance” as “the reciprocal of resistance”.

3.10 Zero-resistance ammeter

An instrument for measuring the current between two electrodes without potential drop

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