In the world of industrial water treatment and metal protection, corrosion remains one of the most persistent and costly challenges. Copper and its alloys—widely used in heat exchangers, cooling systems, and automotive components—are particularly vulnerable to atmospheric and chemical corrosion. Sodium Benzotriazole (BTA·Na) , the sodium salt of benzotriazole (CAS 15217-42-2), has emerged as the industry’s preferred solution for protecting these critical metal assets.
Superior Water Solubility for Demanding Applications
While benzotriazole (BTA) itself is a well-known corrosion inhibitor, its limited water solubility—approximately 20 g/L—has historically restricted its direct use in aqueous systems. BTA·Na solves this fundamental limitation with an exceptional aqueous solubility of up to 1000 g/L, enabling high-concentration liquid inhibitor formulations that can be easily dosed and dispersed in water-based systems. Industrial BTA·Na products are typically supplied as pale yellow transparent liquids with a solid content of 30% or 50%, in a weakly alkaline aqueous solution.
The Science of Protection: How BTA·Na Works
BTA·Na functions as a heterocyclic corrosion inhibitor that chemisorbs onto copper and copper alloy surfaces, forming a polymeric protective film that is only a few molecules thick. This thin yet durable barrier effectively shields metals from atmospheric corrosion and attack by harmful media. The protection mechanism is particularly elegant: BTA·Na reacts with copper surfaces to create a stable complex that prevents both oxidation (such as the formation of green patina) and electrochemical corrosion.
Beyond direct surface protection, BTA·Na also prevents the migration of copper ions into the water stream—a critical function because dissolved copper ions can catalyze the corrosion of aluminum, iron, and other metals. In heat transfer media, copper ions can cause pitting corrosion of aluminum, making BTA·Na an essential additive for any system containing mixed metals.
Broad-Spectrum Industrial Applications
Circulating Cooling Water Systems: BTA·Na is the corrosion inhibitor of choice for protecting copper and copper alloy components in cooling water systems. At recommended dosages of just 2–4 mg/L in circulating water, it delivers excellent corrosion protection. It can be used together with a wide variety of scale inhibitors and biocides, making it highly compatible with comprehensive water treatment programs.
Automotive and Industrial Antifreeze: BTA·Na is widely used in automotive engine coolants and internal combustion engine cooling systems. By preventing copper ions from catalyzing the oxidation of ethylene glycol, it significantly reduces the corrosive aggressiveness of the coolant.
Solar Energy and Nuclear Power: The compound finds critical applications in solar energy conversion systems and nuclear power plant reactor cooling systems, where reliable corrosion protection is absolutely essential.
Lubricants and Metalworking Fluids: BTA·Na serves as an effective antioxidant additive and metal deactivator in lubricating oils. It also functions as a rust preventive, anti-tarnish agent for copper and silver, coating additive, and lubricating oil additive.
Synergistic Performance: When used in combination with other corrosion inhibitors such as tungstates, BTA·Na exhibits synergistic effects that further enhance its protective capabilities.
Partner with a Trusted BTA·Na Manufacturer
For industries seeking a reliable source of high-quality BTA·Na, Shandong Kairui Chemistry Co., Ltd. stands as a professional manufacturer with over 20 years of experience in R&D, production management, and supply chain operations, backed by more than 15 years of export expertise. The company is dedicated to providing premium corrosion inhibitors and water treatment chemicals to the global market.
With a comprehensive product portfolio that includes BTA·Na (Sodium Salt of 1,2,3-Benzotriazole, CAS 15217-42-2) in both liquid and solid forms, Shandong Kairui Chemistry serves diverse industries ranging from water treatment and automotive to power generation and metalworking.
Contact Shandong Kairui Chemistry Co., Ltd. today to discuss your BTA·Na requirements:
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TEL: +86-632-3671188
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E-mail: export@krchemical.com
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ADD: No.1, Fuqian South Road, Xuecheng Chemical Industrial Park, Xuecheng District, Zaozhuang City, Shandong Province, China