Comparison of TA2 and TA10 Plates| 3 operating conditions selection guide

The equipment supervisor of a chemical enterprise in Jiangsu often faces a difficult problem when selecting the project: the reactor equipment is selected TA2Titanium PlateOr TA10 titanium molybdenum nickel alloy plate.TA2 purchase unit price is lower, but in the reducing medium environment corrosion resistance is limited;TA10 alloy has outstanding crevice corrosion resistance, but its procurement cost is higher.Once the wrong brand is selected, subsequent equipment maintenance and replacement will incur high expenses.This paper combines 3 real working cases and 4-step selection judgment method, Help engineers select titanium grades, Control project cost under the premise of meeting safety conditions.

TA2 and TA10 are two of the most commonly compared titanium grades in the chemical corrosion field.TA2 belongs to industrial pure titanium, corresponding to national standard Gr2;TA10 is a titanium-molybdenum-nickel alloy with a grade composition of Ti-0.3Mo-0.8Ni.Many buyers will have the misconception that the higher priced TA10 must be suitable for all scenarios.In fact, the core of material selection lies in the matching of working conditions, the wrong grade will not only result in material waste, It will also significantly shorten the service life of the equipment.Below from material properties, corrosion life, project case, Selection method several dimensions, The system explains the selection logic of TA2 and TA10.

According to GB/T 3620.1, TA2 main component is pure titanium, Titanium content not less than 99.2%, No additional molybdenum added, nickel alloy elementTA10 titanium-molybdenum-nickel alloy, titanium matrix added about 0.3% molybdenum, 0.8% nickel.Addition of Mo and Ni, Significantly improved crevice corrosion resistance of TA10 in chloride ion containing environments, This is also the core reason why the price of TA10 material is higher than TA2.

In corrosion resistance, TA2 is stable in neutral medium and weak oxidizing medium.The core advantages of TA10 are chloride, reducing media and the presence of crevice structures.In neutral seawater, the corrosion life of the two materials has little difference.But in vacuum salt making, Corrosion environment such as dilute sulfuric acid, TA2 is prone to crevice corrosion, pitting failure, The TA10 can operate stably for a long time.

In neutral seawater environment, the estimated service life of TA2 and TA10 can reach about 10 years, and TA2 is preferred to be more cost-effective;Under weak oxidizing dilute nitric acid conditions, the life of the two materials is also close, and TA2 can meet the use requirements.Under chloride solution conditions, TA2 Estimated life span 5 to 8 years, Risk of pitting, TA10 is stable for about 10 yearsWorking conditions of vacuum salt making containing sodium chloride crystallization, TA2 has a life span of only 5 to 7 years, Crevice corrosion is very easy to occur, Recommended TA10 for this conditionDilute sulfuric acid such as reducing medium environment, TA2 Life expectancy 3 to 5 years, TA10 can maintain stable operation for about 10 years.

Case 1: chlor-alkali industry electrolyzer cover plate.The working medium is saturated brine, Chlorine and sodium hydroxide, Temperature range 80-90℃, ordinary pressure, There are a lot of gap structures between bolts and washers on equipment cover plates.The company initially chose TA2Titanium PlateAfter 3 years of operation, serious pitting and local perforation occurred at the crack position.After replacement with TA10 titanium molybdenum nickel alloy plate, no pitting corrosion occurred after 5 years of continuous operation.Chlor-alkali equipment has a lot of gap structure, the medium contains chloride ions, TA10 is recommended.

Case 2: vacuum salt evaporation tank heating chamber.The medium is saturated sodium chloride solution and steam, Temperature 120-140℃, negative pressure, There is a gap between the tube plate and the heat exchange tube, Salt crystals tend to accumulate.TA2 plate used in the early stage, Corrosion failure occurred at the tubesheet crevice after 4 years of operation, After replacing TA10 plate, it has been running stably for 6 years.The vacuum salt making condition belongs to the typical application scenario of TA10, and it is not recommended to use TA2 instead.

Case 3: sports equipment golf head.Use environment for air, rain, sweat, normal temperature and pressure, lightweight materials, surface molding effect requirements are high.The corrosion environment of this scene is mild, TA2Titanium PlateFully meet the needs of use, TA10 selection results in performance redundancy, Increased procurement costs, Therefore, TA2 is more cost-effective.

The first step is to determine the type of media.seawater, neutral medium such as fresh water, oxidizing medium such as dilute nitric acid, alkali environment, No special crevice corrosion risk, Select TA2dilute sulphuric acid, Reducing acids such as hydrochloric acid, High concentration chloride ion medium, Equipment has gap structure, TA10 is preferred. Second, check the operating temperature.60℃ and below normal temperature environment, according to the medium selection brand;60℃ to 100℃ medium temperature condition, corrosion rate increases, need careful evaluation;If the temperature exceeds 100℃, corrosion accelerates, and TA10 is preferred for strong corrosion conditions. The third step is to evaluate the equipment structure.TA2 can be selected for the integral plate structure without accumulation deposits, flange gaskets and tube plate gaps;TA10 is recommended for flange connections, tube sheet joints and gap structures where deposits are easy to accumulate. The fourth step is to evaluate the budget.Neutral and mild conditions, priority TA2 to reduce procurement costs;Strong corrosion, crevice conditions, priority TA10, reduce the cost of equipment shutdown maintenance in the later period.

Tips for selecting materials, Both grades can be welded, TA10 Welding Recommendations Special Welding Wire, Passivation treatment shall be done after welding.Material approach acceptance can check chemical composition through spectrum detection, and cooperate with mechanical property detection to ensure that materials meet national standards.

Relying on the advantages of Baoji China Titanium Valley Industrial Cluster, Shaanxi Qianyi Tuoda Technology can supply TA2 industrial pureTitanium PlateTA10 titanium-molybdenum-nickel alloy plate, regular specifications in stock sufficient, support non-standard custom processing.Material certification documents and test reports attached to each batch of titanium materials, Media available according to customer, temperature, Equipment structure parameters Provide free material technical support, Zhulihuagong, salt manufacturing, Titanium material selection shall be well done for marine equipment projects.

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