High-Purity Solvents, Water Treatments

Tolyltriazole (TTA)

Tolyltriazole (TTA), identified by CAS number 29385-43-1, is a high-efficiency aromatic corrosion inhibitor specifically formulated for the protection of copper and copper-based alloys. Chemically, it is a mixture consisting primarily of 4-methylbenzotriazole and 5-methylbenzotriazole. TTA functions through a chemisorption mechanism, where the lone-pair electrons from the triazole nitrogen atoms form coordination bonds with metal surface ions. This process creates a thin, tenacious, and insoluble monomolecular protective film that acts as a physical barrier against corrosive agents such as dissolved oxygen, chlorides, and sulfides.

Renowned for its thermal and chemical stability, TTA remains effective across a broad range of temperatures and pH levels. It is a critical component in industrial water treatment, automotive chemistry, and metal finishing. Beyond its primary role in yellow metal protection, TTA demonstrates excellent compatibility with other treatment chemicals, often exhibiting synergistic effects that enhance the overall performance of multi-metal corrosion inhibition programs.

Attributes

Key Features and Benefits

Superior Yellow Metal Inhibition: Forms a robust protective layer on copper, brass, and bronze, significantly reducing corrosion rates.
Low Treat Rates: Provides effective protection at very low concentrations (typically 1–10 ppm), making it a cost-effective solution for large-scale systems.
Oxidative Stability: Exhibits high resistance to degradation in the presence of oxidizing biocides like chlorine and bromine.
Thermal Resilience: Maintains its inhibitory properties in high-temperature heat exchange environments without decomposing.
Synergistic Capabilities: Enhances the performance of steel inhibitors (like phosphonates) and scale inhibitors in complex water treatment formulations.
Ease of Application: Available in various physical forms (granules, flakes, or liquid salts) to suit different manufacturing and dosing requirements.

Specifications

Technical Highlights

Molecular Formula: C₇H₇N₃
Molecular Weight: 133.15 g/mol
Physical Appearance: White to off-white granules or fine flakes; also available as a 50% sodium salt solution.
Melting Point: Range of 80°C to 86°C.
Solubility Profile: Slightly soluble in water; highly soluble in organic solvents such as methanol, ethanol, and ethylene glycol, and readily soluble in dilute alkaline solutions.
Vapor Pressure: Negligible at room temperature, ensuring low volatility and high stability in open systems.
Purity Standards: Industrial grades typically offer a purity level of ≥99.0%.
pH Stability: Stable and effective across a wide pH range (6.0–12.0).

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Industrial Cooling Water: Prevents corrosion in recirculating cooling towers, heat exchangers, and chilled water loops.
Automotive Engine Coolants: A primary additive in antifreeze formulations to protect copper radiators and brass components.
Metalworking Fluids: Used in semi-synthetic and synthetic cutting fluids to prevent staining and corrosion of non-ferrous metal parts during machining.
Lubricating Oils: Acts as an antioxidant and corrosion inhibitor in hydraulic fluids, turbine oils, and specialized greases.
Electronics and Semiconductors: Utilized in cleaning solutions and CMP (Chemical Mechanical Planarization) slurries to protect copper interconnects.
Vapor Phase Corrosion Inhibition: Incorporated into specialized paper or plastic packaging to protect metal goods during maritime shipping.