Titanium anode for sodium hypochlorite generator
Electrolytic sodium hypochlorite generator
Titanium anode for sodium hypochlorite generator, with their excellent corrosion resistance, good electrical conductivity and high electrochemical activity, significantly enhance the generation efficiency and purity of sodium hypochlorite, while also extending the service life of the equipment. In practical applications, titanium anodes demonstrate the advantages of long service life, stable electrochemical performance and good corrosion resistance, effectively reducing the maintenance costs of the equipment.
Sodium hypochlorite generators, as core water treatment equipment, produce sodium hypochlorite by electrolyzing salt water and are widely used in drinking water disinfection, medical wastewater treatment, and food industry sterilization. Titanium anodes, as an important component of the generators, directly affect the generation efficiency of sodium hypochlorite and the stability of the equipment.
Principles of Titanium anode for sodium hypochlorite generator
The core principle of a sodium hypochlorite generator is to produce sodium hypochlorite (NaClO) by electrolyzing saline water (NaCl solution). The electrochemical reaction process is as follows:
Anode reaction: 2Cl⁻ → Cl₂↑ + 2e⁻
Secondary reaction: Cl₂ + H₂O → HClO (hypochlorous acid) + H⁺ + Cl⁻
Titanium anodes play a dual role in this process:
Catalytic chlorine evolution: By reducing the overpotential for chlorine evolution (approximately 0.2V), the current efficiency is increased to 85%-95%.
Corrosion resistance protection: The noble metal oxide coating on the titanium substrate surface can withstand a strongly corrosive environment with a pH range of 2-7, and its service life exceeds 3 years.
Titanium Anode Materials and Structure
Substrate Treatment: Gr1/Gr2 pure titanium plates are used, and a micro-scale rough surface is formed through sandblasting (particle size 60-120 mesh) and oxalic acid etching processes, which increases the coating adhesion by 40%.
Coating Formulations: The mainstream solutions include:
Ruthenium-Iridium-Titanium ternary system (such as RuO₂-IrO₂-TiO₂): The chlorine evolution potential is as low as 1.13V, and it has excellent reverse polarity resistance.
Gradient composite coating: The bottom layer is a transition layer, and the surface layer is a nanoscale chlorine evolution coating, extending the service life against acid-base impact to 8,000 hours.
Titanium anodes, as the core components of sodium hypochlorite generators, have a decisive impact on the economy and reliability of the overall system through their efficiency and service life during the electrolysis process. This is mainly attributed to the excellent properties of titanium anode materials, including corrosion resistance, good electrical conductivity, and high electrochemical activity.
The corrosion resistance of titanium anodes is one of the key factors for their wide application. During electrolysis, the anode material needs to withstand a strong oxidative environment, while titanium anodes can maintain stable chemical properties in such environments, effectively resisting corrosion and thus extending the service life of the equipment. In addition, titanium anodes have good electrical conductivity, meaning they can efficiently transfer current during electrolysis to improve electrolysis efficiency. Meanwhile, their high electrochemical activity enables titanium anodes to more easily participate in chemical reactions during electrolysis, further enhancing the generation efficiency of sodium hypochlorite.
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