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IS 15488:2004 is the Indian Standard (BIS) for zinc flake coatings for protection of ferrous components against corrosion - specification. This standard specifies the requirements for non-electrolytically applied zinc flake coatings designed for the corrosion protection of ferrous components. It classifies coatings based on their performance in salt spray tests and their coefficient of friction, covering aspects like thickness, adhesion, and material composition.
Specifies requirements for zinc flake coatings applied to ferrous components for corrosion protection.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Painting, Coatings and Surface Finishing
! A major advantage over galvanizing is the absence of hydrogen embrittlement risk, making it suitable for high-strength steels (strength > 1000 MPa).
! The specification covers both systems with and without hexavalent chromium (Cr VI). Cr VI-free coatings are required for compliance with environmental regulations like RoHS and ELV.
! A separate top coat is often applied over the zinc flake base coat to enhance corrosion resistance, provide color, and control the coefficient of friction.
Similar coating technology but specifically focused on fasteners, whereas IS 15488 is for general ferrous components.
EN 13858:2008European Committee for Standardization (CEN), Europe
HighWithdrawn
Non-electrolytically applied zinc flake coatings on iron or steel components
Almost identical scope, covering general iron and steel components, not limited to fasteners.
ASTM F1136 / F1136M - 18American Society for Testing and Materials (ASTM), USA
MediumCurrent
Standard Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners
Covers similar zinc/aluminum flake coatings but is specifically for fasteners and has different classification systems.
DIN EN ISO 10683:2019-05Deutsches Institut für Normung (DIN), Germany
HighCurrent
Fasteners - Non-electrolytically applied zinc flake coatings (ISO 10683:2018); German version EN ISO 10683:2018
German adoption of the ISO standard, therefore also focused specifically on fasteners.
Key Differences
≠IS 15488:2004 allows for coatings containing hexavalent chromium (Cr6+), common at the time of publication. Modern international standards like ISO 10683:2018 are strictly Cr6+-free to comply with regulations like RoHS.
≠IS 15488 specifies coating requirements based on thickness grades (Grade I: 5-8 µm, Grade II: 8-12 µm). ISO 10683:2018 specifies performance via codes (e.g., A480 for white rust, R720 for red rust) and links them to minimum coating mass, not thickness.
≠The scope of IS 15488 is for general 'ferrous components', while major international standards like ISO 10683 and ASTM F1136 are specifically tailored for fasteners, including detailed requirements for coefficient of friction (CoF).
≠ISO 10683 provides a more extensive and flexible system for specifying corrosion resistance (e.g., R480, R720, R1000), allowing purchasers to select higher performance levels than the maximum 480h specified in IS 15488.
Key Similarities
≈All standards specify a non-electrolytic application process (e.g., dip-spin, spray) to provide sacrificial corrosion protection, which inherently avoids the risk of internal hydrogen embrittlement associated with electroplating.
≈The primary method for evaluating corrosion resistance across all standards is the Neutral Salt Spray (NSS) test, conducted according to ISO 9227 or its equivalent, ASTM B117.
≈All standards require a test for coating adhesion, typically a tape test based on the principles of ISO 2409 (Cross-cut test) or ASTM D3359.
≈The fundamental coating composition is similar, based on a dispersion of zinc flakes (often with aluminum flakes) in a binder system that is cured to form the protective layer.
Parameter Comparison
Parameter
IS Value
International
Source
Hexavalent Chromium (Cr6+) Content
Permitted in certain classes (e.g., with chromate passivation).