Complete Solution of TA9 Titanium Palladium Alloy under Reducing Acid Condition| 5 scenarios + domestic import price comparison +3 cases

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

Top pipe of oxidation reactor in PTA plant, Drawing clearly requires TA9 titanium palladium alloy, Suppliers quote TA10 titanium molybdenum nickel alloy, The two types of materials seem similar, Performance varies greatly.TA9 is Ti-0.12~0.25Pd titanium palladium alloy, TA10 is Ti-0.3Mo-0.8Ni titanium molybdenum nickel alloy, the two can not be mixed.The corrosion rate of TA9 in boiling 5% hydrochloric acid environment is only 1/500 of TA2, TA10 does not have this corrosion resistance advantage in reducing acid conditions.This paper systematically explains the key points of reducing acid condition selection of TA9 titanium palladium alloy, processing technic, Implementation standards and engineering cases, For chemical equipment design, Reference for purchasing staff.

Taking root in Baoji China Titanium Valley, Shaanxi Qianyi Tuoda Technology Co., Ltd. deeply cultivatedTitanium non-standard equipmentCustomized for many years, TA9 titanium palladium alloy sheet available, pipe fitting, Composite plate and non-standard component processing services, Adapt to all kinds of reducing acid corrosion conditions.titanium pipeFull solution to selection

In titanium alloy category, TA2 is general purpose industrial pure titanium, TA10 is mainly crevice corrosion resistant, TA9 Ti-Pd alloy can be regarded as the best material in reducing acid condition.TA9 Add 0.12-0.25% noble metal palladium to industrial pure titanium matrix, Procurement costs 5 to 8 times higher than TA2, However, palladium can maintain the passivation film on titanium surface continuously in reducing acid environment, Significant improvement in corrosion resistance, This is also the core reason for the continued growth of TA9 market demand. Traditional materials have a limited service life in various reducing acid scenarios, PTA oxidation reactor top pipe selection 316L PTFE lining material, Generally, maintenance and replacement are required after 3-5 years of use, After replacing TA9 material, the service life of the equipment can reach more than 10 yearsSulfuric acid titanium dioxide acid hydrolysis pot uses 316L plate, usually 1 to 2 years will appear perforation, after replacing TA9 equipment can run stably for 8 years;Hastelloy C276 was selected for phosphoric acid extraction tank although available, However, procurement costs are high, The TA9 program has a service life of up to 15 yearsThe dye chlorination kettle pipe is made of glass lining material, which is not resistant to heat shock damage. It can be used for 8 years after TA9 modification.Electroplating chromium acid mist tower 316L material 2 to 3 years of corrosion, TA9 products can be used for 12 years.According to the statistical data of Titanium Zirconium Branch of China Nonferrous Metals Industry Association, In 2024, the domestic market scale of TA9 titanium-palladium alloy products is about RMB 650 million Yuan, Annual growth rate of 22%, PTA and titanium dioxide account for 55% to 60% of the total demand for TA9.

TA9 core matrix is titanium metal, Palladium content is controlled between 0.12 and 0.25 percent, It is the core component to ensure the corrosion resistance of reducing acid., iron, oxygen, carbon, nitrogen, Hydrogen as impurity element, Content needs to be strictly controlled.The brand standard can be compared with domestic and foreign specifications, GB/T 3620.1-2016;American Standard UNS Number R52400, ASTM Grade7;European standard Ti Grade7, corresponding to grade 3.7035;TP 340Pd. Various types of titanium and nickel-based alloys have different performance positioning, TA2 commercially pure titanium, suitable oxidizing acid, seawater, wet chlorine condition, As a benchmark for price comparisonTA9 titanium palladium alloy, adapted dilute sulfuric acid, phosphoric acid, Reducing acid environment such as hydrochloric acid, Procurement costs are 5 to 8 times that of TA2TA10 titanium molybdenum nickel alloy, The advantage lies in crevice corrosion, high temperature wet chlorine condition, Prices are 1.5 to 1.7 times TA2TC4 titanium aluminum vanadium alloy, mainly high-intensity pressure scenarios, the price is 1.4 to 1.6 times that of TA2;Hastelloy C276, Adapt to strong reduction high temperature conditions, Prices are 8 to 12 times higher than TA2.Titanium PlateFull solution to selection

Corrosion test data can directly reflect the corrosion resistance advantages of TA9, Boiling state 5% hydrochloric acid medium, TA2 Corrosion rate 5 to 8 mm per year, Not resistant to this condition, The corrosion rate of TA9 does not exceed 0.01 mm per year, The corrosion rate is only 1/500 of TA2Boiling 10% sulfuric acid environment, TA2 corrosion rate 3 to 5 mm per year, TA9 no more than 0.05 mm per year, corrosion resistance increased dozens of times;In boiling 30% phosphoric acid medium, the annual corrosion rate of TA2 is 1 to 2 mm, and that of TA9 is no more than 0.03 mm;Boiling 50% acetic acid and 80 ℃ wet chlorine environment, There is no significant difference between TA9 and TA2 corrosion performance., This kind of working condition does not need to choose high-priced TA9 material.

TA9 titanium palladium alloy is widely used in the five reducing acid industry.PTA/PET industry oxidation reactor top pipe, medium for 120℃ bromine-containing acetic acid, 0.8MPa working conditions, common specifications DN600;Titanium dioxide sulfuric acid method acid hydrolysis pot, medium 20-40% dilute sulfuric acid, temperature 60 - 80℃, specifications cover DN200-DN800;Phosphoric acid fertilizer industry extraction tank, concentration evaporator, Boiling 30% phosphoric acid medium, Specifications DN300-DN1000Dye intermediate chlorination kettle, sulfonation kettle, Contact hydrochloric acid, chlorine, sulfuric acid mixed mediumchromium plate bath in electroplating PCB industry, Acid mist tower, chromic acid, Sulfuric acid chloride ion environment, Specifications DN100-DN400.

Share three sets of real engineering cases.Case 1, 600,000 tons PTA unit oxidation reactor top nozzle, specification DN600, TA9 material, medium 120℃ containing bromoacetic acid, 0.8MPa, original 316L lining tetrafluorine3 -5 years failure, TA9 after transformation stable operation for 8 years without corrosion;Case 2, titanium dioxide factory sulfuric acid hydrolysis pot, using TA9 + Q345R composite plate, coating thickness of 4 mm, according to NB/T 47002 standard acceptance, medium 20 - 40% dilute sulfuric acid, 60 - 80 ℃, replace the original 316L plate, continuous operation for 6 years without perforation;case III, Chlorination kettle for fine chemical dye intermediate, Capacity 1 cubic DN500 jacketed reactor, Hydrochloric acid chlorine sulfuric acid mixed acid 70℃ normal pressure condition, The original glass-lined equipment has hidden dangers of thermal shock, TA9 has been running stably for 5 years after transformation, All TA9 welds completed 100% RT and PT NDT.TC4 titanium alloy selection solution

TA9 processing is significantly different from TA2 processing., Palladium is easy to burn up above 400℃, The whole process needs temperature control and argon protection.The complete procedure is incoming inspection of the sheet material, verification of the material certificate and re-inspection of the palladium content;NC blanking, reserve 2-3mm machining allowance;3D modeling sheet metal unfolding;Roll round or square forming, cold forming priority, avoid high temperature oxidation;tooling alignment positioning, argon arc welding, the whole process of high-purity argon protection, control the interlayer temperature does not exceed 100℃;Weld appearance inspection, key weld 100% penetration inspection and ray inspection;pickling passivation treatment;Hydrostatic test, test pressure is 1.5 times of design pressure;Nitrogen filled or vacuum protected, packed in wooden cases.The key points of processing link control, cutting and grinding are prohibited to avoid iron pollution;Welding temperature is strictly controlled to prevent palladium burning. Once palladium is consumed, the material will lose its reducing acid corrosion resistance.

TA9 material design and manufacture comply with domestic and foreign complete sets of standards, domestic GB/T 3620.1-2016 stipulates TA9 brand composition, plate, bar, pipe respectively refer to GB/T13810, GB/T2965, GB/T3624;Pressure welding qualification NB/T47014, penetration nondestructive testing NB/T47013.5, TA9 composite plate acceptance basis NB/T47002.ASTM B265 plate standard, ASTM B348 bar standard, ASTM B861 pipe standard and ASME BPVC Section IX can be selected as welding qualification basis for international codes.Purchase contract proposal synchronization agreement GB and ASTM related technical terms, Prevent suppliers from using TA2, TA10 impersonates TA9.

The market price reference in the second quarter of 2026, the unit price of domestic TA9 thin plate 2-4mm annealed plate is 1000-1250 yuan per kg, the medium plate 4-10mm is 900-1100 yuan per kg, and the thick plate 10-30mm is quoted at 850-1050 yuan per kg;The price range of TA9 bars, tubes and forgings is 950 to 1500 yuan per kilogram, and the price of imported products of the same specification is 2 to 2.5 times higher.For comparison, the unit price of TA2 plate is only 70-110 yuan per kilogram, and the unit price of Hastelloy C276 is 3000-5000 yuan per kilogram.Domestic TA9 production process mature, Baoji titanium valley industry chain complete, Domestic products can meet the needs of most pressure-bearing chemical equipment.

TA9 has high market value and is a high-risk category for titanium procurement. It can be verified by three-step method.The first method uses XRF instruments to detect palladium characteristic peaks, Genuine TA9 can detect palladium element, The content falls within the range of 0.12-0.25%., TA10 No palladium detectedThe second is ICP chemical analysis by a third-party laboratory as an authoritative means of judgment;The third boiling 5% hydrochloric acid immersion test, Genuine TA9 immersion without obvious corrosion, TA2 specimens corrode rapidly.Procurement TA9 must be clearly identified in the contract, Palladium content range, Third-party testing reports and implementation standards, Reduce procurement risk.

TA9 titanium palladium alloy and Hastelloy C276 are both high-end materials for reducing acid conditions, The two apply to different scenarios.TA9 density 4.5g/cm ³, lighter weight, excellent chloride ion oxidation resistance under 300 ℃ conditions, less metal ion precipitation;Hastelloy C276 density 8.89g/cm³, outstanding high temperature resistance, can withstand 1100℃ high temperature, but nickel ion precipitation risk, processing is more difficult.Selection suggestions, Temperature not exceeding 300℃, reducing acid mediator, There is a clean metal ion precipitation requirements, Priority TA9Hastelloy C276 is selected when the temperature exceeds 300 DEG C and the working condition of strong concentrated reducing acid is adopted;With limited budget and weak corrosion conditions, TA10 titanium molybdenum nickel scheme can be evaluated.

TA9 selection can follow a five-step process, the first step to confirm the medium composition, concentration, temperature and pressure and chloride ion content;The second step is to distinguish between reducing and oxidizing acids, dilute sulphuric acid, hydrochloric acid, Reducing acids such as phosphoric acid are preferred TA9, wet chlorine, Nitric acid TA2thirdly, selecting a titanium material grade;step four, determine that size specification of the plate, the pipe and the forging;The fifth step is to agree on the inspection items, and the palladium content detection is listed as a mandatory inspection item.

Industry development, TA9 material refined towards palladium content, composite plate cost reduction, Palladium metal recovery and utilization in three directions, TA9 composite plate with 3-5mm titanium palladium coating with carbon steel base, It can reduce material costs by 30%-50%.The market demand keeps growing steadily. The domestic TA9 product market scale will be CNY 650 million in 2024, CNY 950 million in 2026 and CNY 2 billion in 2030.

written in the end

TA9 is not a simple, expensive upgrade to TA2., It is a special titanium alloy material under reducing acid corrosion conditions.Although the unit purchase price is higher, However, the service life of equipment can be extended from 1-2 years to 8-15 years, Comprehensive life cycle costs are more advantageous.If the working condition is wrong, TA2 or TA10 is selected., The equipment will be perforated in a short time, Bring about shutdown losses. If you are doing PTA, titanium dioxide, phosphoric acid, dye, Equipment selection for electroplating reduction acid conditions, Technical communication and procurement quotation, This selection guide can be used as a reference, Convenient docking design institute, Manufacturers and internal purchasing departments.

disclaimer, Case Study, corrosion data, The market quotation is only used as a technical selection reference, Not as a formal commercial offer commitment.Material actual service effect is affected by medium, temperature, welding technology, Impact of on-site operation and maintenance conditions, Shaanxi Qianyi Tuoda Technology Co., Ltd. reserves the right to interpret this article.