ISO 8044:2020

Overview

ISO 8044:2020, titled Corrosion of Metals and Alloys - Vocabulary, is an essential international standard developed by the International Organization for Standardization (ISO). This fifth edition standard provides a comprehensive vocabulary of terms relating to corrosion, widely used in modern science and technology. It consolidates important definitions to ensure uniform understanding and communication within the corrosion and materials science communities worldwide.

The document applies strict IUPAC rules for electrode potential signs and uses the term “metal” inclusively, covering alloys and other metallic materials. ISO 8044:2020 ensures clarity by defining the corrosion process, its effects, and associated phenomena at multiple levels, from general corrosion to specific types such as pitting, crevice, galvanic, and microbiologically influenced corrosion. The standard excludes related terms involving inorganic surface treatments, which are covered separately under ISO 2080.

Key Topics

ISO 8044:2020 covers a broad range of corrosion-related vocabulary categorized into key thematic sections:

• General Corrosion Terms: Definitions for corrosion process, corrosive agents, corrosion system, corrosion rate, corrosion resistance, and serviceability. The standard precisely differentiates between corrosion effects, corrosion damage, and corrosion failure.

• Types of Corrosion: Clear terminology for various specific corrosion types including:

  • Electrochemical corrosion – involving anodic and cathodic reactions
  • Chemical corrosion – non-electrochemical processes
  • Atmospheric, marine, underground, and bacterial corrosion
  • Localized corrosion types such as pitting, crevice, galvanic (contact) corrosion, and selective corrosion including dezincification and graphitic corrosion
  • Special processes like erosion corrosion, cavitation corrosion, fretting corrosion, and wear corrosion

• Corrosion Protection: Although primarily vocabulary-focused, ISO 8044 references protection concepts like pickling and electrochemical protection, clarifying the objective of minimizing corrosion damage rather than solely preventing corrosion.

• Corrosion Testing and Electrochemical Concepts: Terms related to electrochemical cells, reaction rates, passivation, and corrosion testing are included to support scientific and industrial testing methodologies.

• Supporting Concepts: The standard elaborates on terms such as critical humidity, corrosion likelihood, time of wetness, and stress corrosion cracking parameters like threshold stress and stress intensity factors.

Applications

ISO 8044:2020 serves as a foundational resource across multiple sectors and applications:

• Metallurgy and Materials Engineering: Facilitates standardized communication and documentation regarding corrosion phenomena in metals and alloys.
• Industrial Manufacturing: Supports quality control and corrosion monitoring in metal fabrication, automotive, aerospace, and infrastructure industries.
• Corrosion Testing Laboratories: Provides standard terminology critical for reporting results consistently across electrochemical and atmospheric corrosion tests.
• Corrosion Protection & Surface Treatment: Assists engineers and scientists in designing effective corrosion mitigation measures by understanding corrosion types and effects.
• Research and Development: Enables clear, shared language for academic research, improving study comparability, and cross-disciplinary collaboration.
• Standards Development and Regulatory Compliance: Aligns technical language in national and international regulation, technical specifications, and materials standards.

Related Standards

ISO 8044:2020 complements and interacts with several other standards in the corrosion and materials field, including:

• ISO 2080: Terms relating specifically to the inorganic surface treatment of metals, focusing on coatings and corrosion protection by metallic and inorganic layers.
• ISO 9223: Corrosivity of atmospheres – provides classification of environments based on corrosion rates.
• ISO 8407: Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens.
• ISO 10289: Corrosion of metals and alloys - Vocabulary of terms related to corrosion testing.
• ISO/TS 12775: Guidelines on corrosion protection for specific environments and metals.
• Technical standards from the International Electrotechnical Commission (IEC) relevant to electrochemical corrosion phenomena and measurement.

Keywords: ISO 8044, corrosion vocabulary, corrosion of metals, corrosion definitions, electrochemical corrosion, localized corrosion, corrosion testing, corrosion protection, metal alloys, corrosion terminology standard, international corrosion standard.