Tannin Rust Inhibitor
CAS Number: 1401-55-4
Tannin-based rust inhibitor and converter that reacts chemically with iron oxides on rusted steel surfaces, converting them into stable ferric tannate complexes that provide a firm base for subsequent coating layers. Derived from natural plant tannins, it offers an environmentally friendly alternative to phosphoric acid rust converters. It is widely used in maintenance coatings applied directly over lightly rusted steel without complete surface preparation.
Technical Specifications
| pH | 3.5–5.5 |
| purity | ≥85% |
| appearance | Brown to dark brown powder or liquid |
Applications
- Rust converter and primer for maintenance coatings
- Industrial maintenance of structural steel
- Bridge and infrastructure rehabilitation coatings
- Marine maintenance coatings
- Architectural protective coatings on weathered steel
Key Features
- Converts rust into stable ferric tannate film
- Bio-based, environmentally friendly raw material
- Can be applied over lightly rusted surfaces (Grade C/D)
- Improves adhesion of subsequent coating layers
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CAS Number
1401-55-4
Category
Anti-Corrosion / FunctionalAvailability
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