Titanium anode selection guide| Class 4 coating + Class 10 industry + true and false discrimination

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-24

When purchasing titanium anode of sodium hypochlorite generator, the equipment supervisor of a chlor-alkali enterprise in Jiangsu Province, Encounter the problem of large market quotation span, The range ranges from 1500 yuan per square meter to 2500 yuan per square meter.Low-priced products actually have the problem of precious metal ratio shrinkage, Some products reduce the iridium content of the coating from 15% to 5%, the actual service life of that electrode is directly shorten from 5 years to 1 year.Titanium anode core value concentrated in precious metal active coating, The coating composition cannot be distinguished by the naked eye, It is easy to steal the ratio of reduction.

Titanium anode is a key electrode material in electrolysis, electroplating and hydrometallurgy industries.Compared to conventional graphite anodes, lead anode, 316 stainless steel anode, Titanium matrix has self-passivation characteristics in oxychloride environment, Even if the coating breaks locally, Corrosion does not diffuse to the substrateTitanium material weight light, can make large area mesh plate, not easy to deform.Graphite anode loss is fast, slag will also pollute the electrolyte, Lead Ion Contaminated Plating from Lead Anodic Deposition, 316 stainless steel is prone to perforation failure at chlorine evolution potential.Titanium anode considering insoluble anode characteristics, chloride ion corrosion resistance, No metal ion precipitation, size stability multiple advantage, in chlor-alkali, water treatment, and is widely applied in the field of hydrometallurgy.

Titanium anode shape is divided into plate, mesh, tubular, ribbon four categories.Plate-shaped for electroplating, electrowinning electrolytic bath, flat plate effective area;Mesh suitable for chlor-alkali, sodium hypochlorite, seawater electrolysis conditions, bubbles easier to escape, higher electrolysis efficiency;Tubular adaptation circulating water treatment, cathodic protection projects, flexible, easy to install on site;Belt-type and basket-type are mostly used for small electrolytic equipment and electroplating hanging tools, and the structure is flexible to adapt to small area working conditions.

The coating systems can be divided into ruthenium, iridium, platinum and lead dioxide titanium-based.Ruthenium-Iridium-Titanium MMO Ruthenium-based coatings are mainly used for chlorine evolution, Suitable for chlor-alkali, sodium hypochlorite, seawater electrolysis, Market reference price 1800‑2600 yuan/㎡, Standard operating life 3‑5 years, However, ruthenium is easy to dissolve in strong oxidizing acid environment at temperature higher than 80℃.Iridium-Tantalum-Iridium Based Coatings are Mainly Oxygen Evolution Reactions, adaptive plating, hydrometallurgical sulfuric acid system, Reference price 2200‑3500 yuan/㎡, strong acid, Normal operating life up to 8‑12 years.Platinum series titanium anode is mainly used in high purity condition, Used for high purity plating, Pharmaceutical electronics industry, Price is affected by platinum coating thickness, Interval 3500 ‑ 15000 Yuan/㎡, Service life up to 10‑15 years.Lead dioxide titanium base is only suitable for sulfuric acid electrodeposition to extract copper and zinc scenes, No contact with chloride ions, Reference Price 2000‑3000 Yuan/㎡, The service life is 2‑4 years.Selection can be simple memory: chlorine evolution ruthenium system, oxygen evolution iridium system, high purity platinum system, sulfuric acid electrodeposition lead dioxide.

Different industry media corresponding to the adaptation of the coating: chlor-alkali, sodium hypochlorite, seawater electrolysis priority ruthenium series;Electroplating, hydrometallurgical electrowinning copper-nickel cobalt, electrolytic copper foil preferred iridium system;Platinum series is selected as high-purity plating solution for medical electronics;Iridium or lead dioxide titanium base can be selected for sulfuric acid system electrodeposition.Purchasing quotation industry generally priced per square meter, Small parts with area less than 0.1m2 shall be quoted as single piece., TA2 titanium substrate costs need to be accounted for separately, ruthenium (Ru), Iridium precious metal market fluctuates greatly, Purchase Inquiry Suggestion Synchronized Price Lock.

Titanium anode coating belongs to invisible structure, procurement needs to be identified and verified.First check the quality certification documents, Clearly indicate coating system and coating loading, Ruthenium-iridium conventional loading 8‑15g/㎡, Iridium − Tantalum Normal Load 10‑20g/㎡, Only general labeling MMO coating does not specify the formula needs to be vigilant.Secondly, XRF fluorescence spectrum is used to detect the peak position of elements to confirm the actual situation of ruthenium, iridium, tantalum and platinum.while observing the appearance of the coating, Ruthenium is dark grey black, Iridium − tantalum is dark brown, Platinum series silver grey, Color mottled titanium is a sintering defect.Also need to do scratch adhesion, 90° bending test, qualified product coating is not easy to fall off powder.

Five common procurement risks in the industry need to be avoided, One is the reduction of precious metal ratio, Nominal ruthenium system actually reduces iridium proportion, Significantly reduce equipment lifeSecond, the coating load shrinks, and the actual coating thickness does not reach the design load;Third, titanium substrate inferior, high impurity recovery titanium as TA1/TA2 genuine;Fourth, the platinum plating thickness is false standard, and the nominal thick platinum layer is actually thinner;Fifth, ignore the actual current density, Low current sodium hypochlorite anode is directly used in high current electrodeposition, Short-term coatings melt off.The purchase contract must clearly state the four key conditions of coating system, coating load, substrate grade and suitable current density.

Manufacturing, Titanium substrates need to be annealed and leveled, Oxalic acid etching for a long time to form pockmarks, Safeguard coating adhesionThe precious metal coating solution is accurately proportioned, and is subjected to multiple brushing and segmented sintering at 450‑550℃;Mesh welding requires tooling to control deformation;TA1 or TA2 pure titanium is preferred as the substrate. Recycling titanium substrate will cause poor adhesion of coating.

Nonferrous metal manufacturer located in Baoji China Titanium Valley can provide multi-coating, Multi-profile titanium anode customization, coating load can be issued, Relevant data of XRF element detection, engineer's binding medium, ampere density, The expected service life is recommended for selection.Titanium Plate: Design considerations for early failure of chemical equipmenttitanium pipePart welding and procurement pit-avoidance guidelinestitanium barBrand selection and machining technology

frequently asked questions

Q: How to choose ruthenium and iridium titanium anodes? A: chlorine evolution reaction occurs, and ruthenium system is selected for brine, seawater and chlorine-containing wastewater;Sulfuric acid system oxygen evolution, electroplating, hydrometallurgy preferred iridium system.

Q: What factors affect the service life of titanium anodes? Coating formulation and loading, substrate quality, working current density, medium temperature, the composition of that electrolyte will directly affect the actual service life.

Q: What must be stated in the titanium anode purchase contract? coating system, Coating loading g/㎡, Titanium substrate designation, Adapting working current density, At the same time, it is required to provide corresponding test data.

disclaimer

This article selection ideas, Price range is based on industry project experience, For technical reference only, Not as engineering design, Direct basis for purchasing contract.ruthenium (Ru), Iridium precious metals market volatility, Actual quotation is subject to market conditions on the day of order, The key electrolysis electrode selection suggestions are evaluated by professional technicians in combination with field conditions.