GOST 9.407-84 PDF

Full title and description

GOST 9.407-84 — "Единая система защиты от коррозии и старения. Покрытия лакокрасочные. Метод оценки внешнего вида" (Unified system of corrosion and ageing protection — Paint coatings — Method of appearance rating). The standard establishes procedures for visual and quantitative assessment of the external appearance of paint coatings on metal surfaces within the unified corrosion-protection system.

Abstract

GOST 9.407-84 defines instruments, materials and procedures for evaluating the appearance of paint coatings (visual and quantitative), describes a generalized (aggregated) evaluation procedure for multiple types of coating degradation, and provides weighting coefficients for different defect types to obtain an overall protective-performance assessment. It was introduced as part of the USSR "Unified system of corrosion and ageing protection" and later amended.

General information

• Status: Withdrawn / not in force in the Russian Federation (application ceased; superseded by later national standards).
• Publication date: Approved 29 June 1984; introduced into effect 1 July 1985. (Amendments issued in 1987/1988 and 1992.)
• Publisher: State Committee for Standards of the USSR (Gosstandart / Межгосударственный стандарт).
• ICS / categories: OKC/OKS codes referenced in catalogues: 25.220.60; 87.020 (coatings, paint industry / corrosion protection).
• Edition / version: Original designation GOST 9.407-84 (first introduced 1985); amended (Amend. Nos. 1 — 1988, No. 2 — 1992).
• Number of pages: 8 pages (typical published copy length).

Scope

The standard applies to paint (lacquer) coatings on metallic substrates and establishes methods for assessing external appearance after manufacture, testing, storage or operation. It specifies required apparatus and materials for inspection, rules for visual evaluation, procedures for quantitative (instrumental) measurement where applicable, and a method for calculating a generalized assessment across multiple defect types to determine overall coating performance. The method is intended for use within the unified system of corrosion and ageing protection.

Key topics and requirements

• Defined apparatus and reference materials for visual and instrumental appearance assessment (lighting, magnification, reference charts).
• Rules and scales for visual evaluation of coating appearance (classification of defects and severity levels).
• Quantitative/aggregate scoring method to combine multiple defect types into a single generalized protection rating using weight coefficients (e.g., for blistering, cracking, flaking, corrosion).
• Procedures for assessment both immediately after coating application and after climatic, operational or storage exposure.
• Normative references to related GOST documents and test methods cited within the standard.

Typical use and users

Used by quality-control and testing laboratories, paint and coating manufacturers, corrosion engineers, R&D groups developing or qualifying protective coatings, procurement and inspection personnel, and standards/technical regulators. It is applied when assessing coating acceptance, performing comparative tests, and documenting coating condition after service or exposure tests.

Related standards

Related documents in the unified system of corrosion protection and coating testing include other GOSTs for coating test methods and requirements (examples: GOST 9.301 series, GOST 9.409-88 and specific test-method standards cited in GOST 9.407-84). In Russian practice the GOST was later superseded in normative application by newer national standards (for example, catalogues list replacement by ГОСТ Р 9.414-2012 / subsequent documents used in the Russian Federation).

Keywords

GOST 9.407-84; appearance rating; paint coatings; lacquer coatings; corrosion protection; unified system of corrosion and ageing protection; visual assessment; quantitative evaluation; coating defects; generalized rating.

FAQ

Q: What is this standard?

A: GOST 9.407-84 is a Soviet-era standard titled "Unified system of corrosion and ageing protection. Paint coatings. Method of appearance rating" that defines visual and quantitative methods to evaluate the external appearance of paint coatings.

Q: What does it cover?

A: It covers required apparatus and materials, visual assessment scales, procedures for quantitative measurement where applicable, and a method to calculate an aggregated (generalized) appearance/protection rating from multiple defect types and severities.

Q: Who typically uses it?

A: Quality and test laboratories, coating manufacturers, corrosion and maintenance engineers, R&D organizations and inspectors working with protective paint coatings.

Q: Is it current or superseded?

A: The standard is no longer in force in the Russian Federation (application ceased and later national standards have been adopted in practice). Catalogues and regulatory summaries indicate it was withdrawn from active use (application ended around 1 January 2014) and related modern national standards are used instead.

Q: Is it part of a series?

A: Yes — it is part of the "Unified system of corrosion and ageing protection" series of standards (GOST 9.xxx family) that cover coatings, test methods and protective requirements.

Q: What are the key keywords?

A: Appearance rating; paint/lacquer coatings; visual inspection; coating defects; corrosion protection; unified system; generalized assessment.