GOST 9.402-2004 PDF

Full title and description

GOST 9.402-2004 — Unified system of corrosion and ageing protection. Paint coatings. Metal surface preparation for painting. This interstate (GOST) standard defines terminology, classification of contamination and corrosion, degrees and methods of preparation of metal surfaces prior to application of paint and varnish coatings, and rules for inspection and acceptance of prepared surfaces.

Abstract

GOST 9.402-2004 provides requirements and recommended procedures for preparing metallic substrates for painting to ensure adhesion and long-term protective performance of paint coatings. The standard covers mechanical and chemical cleaning methods, classification of cleanliness levels, inspection tests and acceptance criteria, and links surface-preparation choices to operating environments and coating system performance.

General information

• Status: Current / in force (acting).
• Publication date: Edition year 2004; entered into force / published for application commonly listed as January 1, 2006.
• Publisher: GOST (Interstate standard) — issued under the Russian standards system (Rosstandart / EASC framework).
• ICS / categories: 25.220.10 (Manufacturing engineering — Surface treatment and coating / Surface preparation).
• Edition / version: GOST 9.402-2004 (with noted amendment(s) in the text; commonly referenced with Amd. 9.06).
• Number of pages: Approximately 44 pages (typical published edition).

Scope

The standard applies to ferrous (and, where specified, non‑ferrous) metallic substrates that are to be protected with organic paint coatings. It specifies: surface condition classes and limits of allowable contamination; recommended mechanical, abrasive and chemical preparation techniques (including degreasing, pickling, abrasive blasting, manual/mechanical cleaning); methods to measure surface cleanliness and profile; and criteria for inspection, testing and acceptance prior to coating application. The standard is intended for industrial and construction applications where long‑term corrosion protection is required.

Key topics and requirements

• Classification of contaminants (oil/grease, scale, rust, old coatings) and corresponding allowable residuals.
• Defined degrees/classes of surface cleanliness and how they relate to service environment and coating selection.
• Mechanical cleaning methods (wire brushing, grinding, shot/sand/abrasive blasting) and recommended levels of mechanized treatment.
• Chemical cleaning and pickling procedures, including degreasing and neutralization steps where required.
• Specification of surface profile (anchor pattern) requirements for proper paint adhesion.
• Inspection and control methods: visual assessment, water‑break test, soluble salt checks, measurement of residual contaminants and surface roughness/profile.
• Acceptance criteria and documentation required before coating application.

Typical use and users

Used by coating system designers, paint manufacturers, surface‑preparation contractors, quality/control engineers, inspectors, fabricators and maintenance teams in industries such as steel fabrication, shipbuilding, oil & gas, petrochemical plants, power generation, bridges and general construction where corrosion protection and durable paint systems are required.

Related standards

GOST 9.402-2004 is part of the GOST "Unified system of corrosion and ageing protection" family. It is used alongside related documents such as GOST 9.032 (general corrosion protection principles), GOST R / ISO standards for visual surface‑cleanliness assessment (e.g., GOST R ISO 8501 series equivalents), and other GOSTs referenced for specific test methods and materials. Users often cross‑reference national or international painting and surface‑preparation standards (ISO, ASTM) when specifying tests or acceptance criteria.

Keywords

surface preparation, paint coatings, metal cleaning, degreasing, abrasive blasting, pickling, surface cleanliness, corrosion protection, GOST 9.402-2004, coating inspection

FAQ

Q: What is this standard?

A: GOST 9.402-2004 is a GOST (interstate) standard titled "Unified system of corrosion and ageing protection. Paint coatings. Metal surface preparation for painting" that sets out methods and acceptance criteria for preparing metal surfaces prior to painting.

Q: What does it cover?

A: It covers classification of surface contamination, recommended mechanical and chemical preparation methods (including abrasive blasting and degreasing), surface profile requirements, inspection and testing methods (visual checks, water‑break test, soluble salt testing, etc.), and acceptance criteria before coating application.

Q: Who typically uses it?

A: Coating specifiers, paint manufacturers, applicators, inspection and quality control personnel, maintenance engineers and fabricators in industries requiring durable corrosion protection use this standard.

Q: Is it current or superseded?

A: The standard is the 2004 edition (commonly referenced as GOST 9.402-2004) and is treated as an acting/current document in the GOST system. Implementation/publication records show the 2004 edition and common in‑force dates in 2006; users should check with the applicable national standards body or purchaser technical specification for any later amendments or national adoptions.

Q: Is it part of a series?

A: Yes — it belongs to the GOST 9 series ("Unified system of corrosion and ageing protection") and is intended to be used together with other GOSTs that address coating systems, test methods and corrosion protection principles.

Q: What are the key keywords?

A: Surface preparation, metal pretreatment, abrasive blasting, degreasing, pickling, surface cleanliness, coating adhesion, corrosion protection, paint systems, GOST.