Platinum Titanium Anodes Manufacturer & Supplier In China

A: A platinum-titanium anode, also known as a titanium-based platinum group metal coated anode, is an insoluble anode made of pure titanium (Gr1/Gr2) coated with platinum or platinum group metal oxides (such as iridium oxide, ruthenium oxide, platinum-iridium composite oxides, etc.). It is also called a metal oxide anode (MMO anode) or a dimensionally stable anode (DSA anode).

The DSA anode was invented in 1965 by the Italian company De Nora. Its core characteristic is that the anode size remains essentially unchanged during electrolysis. It exhibits stable electrochemical performance and a lifespan far exceeding that of traditional graphite and lead alloy anodes. Essentially, all three are the same type of product, just with different emphases in their names: platinum-titanium anodes emphasize the substrate and coating composition, MMO anodes emphasize the material properties of the coating, and DSA anodes emphasize the dimensional stability of the product.

A: Platinum-titanium anodes have six irreplaceable core advantages over traditional anodes:

1. Excellent dimensional stability: The anode experiences virtually no loss during electrolysis, its size remains unchanged, current distribution is consistently uniform, and electrolysis performance is stable and controllable.

2. Superior electrochemical performance: Chlorine and oxygen evolution overpotentials are extremely low, and cell voltage is 10-30% lower than lead alloy anodes, significantly reducing energy consumption.

3. Long lifespan: Platinum-titanium anodes have a lifespan of 3-20 years, far exceeding that of graphite anodes (1-2 years) and lead alloy anodes (1-3 years).

4. Pollution-free: No emissions of lead, graphite, or other pollutants, fully complying with global environmental regulations and completely solving hazardous waste disposal problems.

5. Wide current density range: Stable operation is possible at current densities ranging from 0.1-10000 A/m², adapting to various operating conditions.

6. Lightweight: The density of titanium substrate is only 1/4 that of lead, and its weight is much lighter than lead alloys and graphite anodes, which greatly reduces the difficulty of installation and maintenance.

A: The core differences lie in the coating structure, performance, and applicable scenarios. The selection must be determined based on the specific operating conditions.

Pure Platinum-Plated Anodes: A layer of high-purity platinum is deposited on the surface of a titanium substrate through electroplating or electroless plating. The coating is dense and has good conductivity. Hydrogen evolution, chlorine evolution, and oxygen evolution potentials are all low, and it is suitable for a pH range of 0-14. It operates stably under high potential and reverse current conditions. The disadvantage is its relatively high cost, and the coating thickness is generally 0.1-10 μm.

Platinum Group Metal Oxide-Coated Anodes: These use platinum group metal oxides (iridium oxide, ruthenium oxide, platinum oxide, etc.) as the main active ingredient. The coating has extremely strong adhesion to the titanium substrate, good corrosion resistance, and extremely low consumption rate. It is suitable for large-scale industrial electrolysis applications, such as chlor-alkali industries, water treatment, and hydrogen production through water electrolysis. The cost is lower than that of pure platinum-plated anodes, offering better cost-effectiveness.

Selection Recommendations: For applications involving high potential, reverse current, complex corrosive environments, and extremely high stability requirements, choose pure platinum-plated anodes. For large-scale industrial electrolysis, long-term stable operation, and cost-sensitive applications, choose platinum group metal oxide-coated anodes.

A: Under reasonable design and operating conditions, the lifespan of a platinum-titanium anode is generally 3-20 years. This depends specifically on the coating system, thickness, and operating conditions. There are six core factors affecting anode lifespan:

1. Coating System and Thickness: The thicker the coating, the longer the lifespan. Iridium-based coatings have a much longer lifespan under oxygen evolution conditions than ruthenium-based coatings. Platinum-based coatings have stronger high-potential resistance.

2. Operating Current Density: Current density is a core factor affecting lifespan. The higher the current density, the faster the coating wears out, and the shorter the lifespan. Under oxygen evolution conditions, a doubling of the current density can shorten the lifespan by more than 50%.

3. Media Environment: Strong corrosive ions such as fluoride ions and cyanide ions in the media can damage the passivation film and coating of the titanium substrate, significantly shortening its lifespan. A pH value exceeding the coating’s applicable range will also accelerate coating wear.

4. Operating Temperature: Temperature has a significant impact on the coating consumption rate. For every 10°C increase in temperature, the coating consumption rate approximately doubles, drastically shortening the lifespan.

5. Reverse Current: Frequent reverse current can cause coating peeling, oxidation of the titanium substrate, severely shortening the anode lifespan, and even leading to instantaneous failure.

6. Operation and Maintenance: Improper installation leading to exposed substrate, prolonged immersion in corrosive media during power outages, and failure to promptly clean surface deposits can all severely affect anode lifespan.

A: The coating thickness for platinum-titanium anodes needs to be determined comprehensively based on the operating conditions, coating system, and cost. Thicker is not always better.

Pure platinum coated anodes: 0.5-5μm for standard operating conditions; 5-10μm for long-life applications such as cathodic protection; 0.1-0.5μm for low-current, short-cycle applications such as scientific research.

Platinum group metal oxide coated anodes: 5-20μm for standard operating conditions; 20-50μm for oxygen evolution conditions, high current density, and long-life requirements; 2-5μm for low-current, short-cycle applications.

Disadvantages of excessively thick coatings: 1) Increased use of precious metals, significantly increasing costs; 2) Increased internal stress in the coating, making it prone to cracking and peeling, thus reducing service life; 3) Increased coating resistance, leading to higher tank voltage and increased energy consumption.

Wstitanium designs the optimal coating thickness based on your specific operating conditions, balancing lifespan, performance, and cost to provide you with the most cost-effective solution.

A: In media containing fluoride ions, the TiO₂ passivation film on the titanium substrate reacts with fluoride ions to form soluble TiF₆²⁻, causing the passivation film to be destroyed. This leads to substrate corrosion, coating peeling, and anode failure.

Generally, in neutral media at room temperature, significant corrosion of the titanium substrate will occur when the fluoride ion concentration exceeds 20 ppm. In high-temperature, acidic media, even 1 ppm of fluoride ions can cause severe corrosion of the titanium substrate.

If the medium contains fluoride ions, Wstitanium will optimize the coating formulation and substrate treatment technology based on the fluoride ion concentration, medium pH, and temperature. For example, this may involve using a fluoride-resistant coating system, increasing titanium substrate pretreatment, and reducing the operating current density. If the fluoride ion concentration is too high (>50 ppm), Wstitanium will recommend using other substrates such as tantalum or niobium.

A: The accelerated life test (also called the enhanced life test) accelerates coating wear under extreme operating conditions (high current density, high temperature, and highly corrosive media). It measures the time from the start of operation to failure of the anode, used to quickly assess the anode’s quality and expected actual lifespan. This is a commonly used anode performance testing method in the industry.

The standard accelerated life test conditions specified in Chinese standard GB/T 26013-2010 are: 1 mol/L H₂SO₄ solution, temperature 25±2℃, current density 2A/cm², and the anode failure criterion is a 5V increase in tank voltage.

The relationship between accelerated life and actual lifespan: Generally, under the same coating system, a longer accelerated life time corresponds to a longer actual lifespan.

The common conversion formula is: Actual lifespan (h) = Accelerated life time (h) × (Accelerated current density / Actual operating current density)² × Temperature correction factor × Medium correction factor.

For example: If an anode has a reinforced life of 100 hours under standard conditions and an actual operating current density of 1000 A/m² (0.1 A/cm²), then its theoretical actual life is approximately 100 × (2/0.1)² = 40,000 hours, or about 4.5 years. This should be adjusted based on actual temperature and medium.

Note: Reinforced life is for reference only; actual lifespan is greatly affected by operating conditions.

A: Titanium possesses excellent passivation properties: In oxidizing media, a dense and stable TiO₂ passivation film quickly forms on the titanium surface, protecting the substrate from corrosion. Simultaneously, this passivation film is an n-type semiconductor, allowing current to be smoothly conducted from the titanium substrate to the active coating on the surface.

Other optional substrates:

Tantalum: Offers better passivation properties than titanium, with stronger resistance to fluoride ions and strong acidic media corrosion. It can operate stably at higher potentials. The disadvantage is its significantly higher cost compared to titanium; it is generally used in special applications requiring strong corrosion and high potentials.

Niobium: Passivation properties fall between titanium and tantalum, but its cost is relatively high, used in some special applications.

Titanium alloys: Such as Gr5 titanium alloy, which has higher strength than pure titanium but slightly lower corrosion resistance. It is generally used for anodes in structural components requiring high strength.

In typical industrial settings, Gr1/Gr2 pure titanium is the most cost-effective and widely applicable anode substrate, conforming to international standards such as ASTM B265 and B338. Wstitanium’s standard products all use Gr1/Gr2 high-purity titanium substrates.

A: There are four main causes of platinum-titanium anode failure:

**Coating active material consumption:** During long-term electrolysis, the platinum group metal active materials in the coating gradually dissolve and are consumed, leading to a decrease in electrochemical performance and an increase in cell voltage. This is the most common cause of normal failure.

**Coating peeling:** Insufficient adhesion between the coating and the titanium substrate, or exposure to mechanical impact, reverse current, or sudden temperature changes, can cause the coating to crack and peel off, exposing the substrate and resulting in anode failure.

**Titanium substrate corrosion:** Strong corrosive ions in the medium (such as fluoride ions) damage the passivation film of the titanium substrate, leading to substrate corrosion and oxidation, causing the coating to peel off from the substrate and resulting in anode failure.

**Conductive joint failure:** Poor welding/connection of the conductive joint leads to excessive contact resistance, causing heat and oxidation, preventing normal conductivity and resulting in anode failure.

**Anode repair after failure:** For anodes with worn or peeled coatings, but where the titanium substrate is not severely corroded or deformed, repair is possible. The repair process is as follows: removal of the failed coating → substrate sandblasting, acid pickling, and passivation treatment → recoating with a new active coating → high-temperature sintering → performance testing → passing. The repaired anode exhibits performance identical to a new anode, at only 30-60% of the cost, making it highly environmentally friendly and economical.

Wstitanium provides professional platinum-titanium anode repair services, offering testing, evaluation, and repair services for both anodes and those manufactured by us.

A: To provide you with the most accurate and suitable custom anodes for your operating conditions, you need to provide the following core parameters:

Application: For example, sodium hypochlorite generators, cathodic protection, water electrolysis for hydrogen production, electroplating, etc., as well as the medium composition, concentration, pH, and operating temperature.

Electrochemical parameters: Operating voltage, operating current/current density, main electrochemical reactions (chlorine evolution/oxygen evolution/other).

Shape and dimensions: For example, plate, mesh, tubular, filament, etc., as well as specific length, width, thickness, tube diameter, wire diameter, mesh size, etc. CAD drawings are preferred.

Coating: Coating type (pure platinum plating/platinum group metal oxide coating), coating thickness, expected service life.

Machining: For example, welding, bending, punching, threading, flange connections, insulation treatment, conductive connector type, etc.

Other requirements: For example, applicable standards, testing requirements, delivery cycle, certification requirements, etc.

If you do not have complete parameters, Wstitanium will provide you with design solutions and parameter suggestions free of charge based on your working conditions.

A: Current efficiency refers to the ratio of the actual amount of electricity used for the target chemical reaction to the total amount of electricity passing through the electrolytic cell during electrolysis. It is expressed as a percentage and is a core indicator for measuring anode performance and electrolysis efficiency. Higher current efficiency means lower energy consumption and lower production costs.

According to Faraday’s First Law: m = kQ = kIt, where m is the mass of the target product, k is the electrochemical equivalent, Q is the amount of electricity, I is the current, and t is time. Current efficiency η = (Actual product mass / Theoretical product mass) × 100%.

Core methods to improve the current efficiency of platinum-titanium anodes:

Selecting a suitable coating system: Choose a coating system appropriate to the target reaction. For example, choose a ruthenium-based coating for chlorine evolution and an iridium-based coating for oxygen evolution to reduce overpotential and improve reaction selectivity.

Optimizing anode structure design: Optimize the anode’s shape, size, and distance from the cathode to ensure uniform current distribution, avoid excessively high local current density, and reduce side reactions.

Suitable operating parameters: Operate within the designed current density, temperature, and pH range to avoid excessive fluctuations that could affect reaction selectivity.

Keep the anode surface clean: Regularly clean deposits and dirt from the anode surface to prevent clogging of coating pores and ensure that active sites fully participate in the reaction.

Optimize the overall electrolyzer design: Optimize electrolyte circulation, diaphragm, cathode materials, etc., to improve the mass transfer efficiency of the entire electrolysis system, reduce concentration polarization, and increase current efficiency.

A: Our platinum-titanium anodes are manufactured and their performance strictly adheres to the following international and national standards:

ASTM B898-20 Standard Specification for Active Coated Titanium Anodes

GB/T 26012-2010 Technical Conditions for Titanium-Based Oxide Coated Anodes

GB/T 26013-2010 Accelerated Life Test Methods for Titanium-Based Oxide Coated Anodes

NACE SP0176-2021 Cathodic Protection Standard for Buried Metal Pipelines

ISO 22734-2019 Technical Specification for Hydrogen Production Systems via Water Electrolysis

AWS D17.1/D17.1M Welding Specifications for Titanium and Titanium Alloys

Supported Certifications and Test Reports:
Factory inspection reports for each batch of products: including material reports, dimensional inspection reports, coating thickness inspection reports, electrochemical performance test reports, and enhanced life test reports, etc.

Third-party testing reports: Supports material, performance, and corrosion resistance testing reports from authoritative third-party organizations such as SGS, CTI, and RoHS.

ISO9001:2015 Quality Management System Certification.