TA9 Titanium palladium alloy plate| Guide to Selection of Reducing Acid Operating Conditions

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-23

The equipment supervisor of a domestic chlor-alkali enterprise encountered corrosion problems when selecting materials. The equipment used TA2 originally.Titanium PlateCrevice corrosion will occur in about two years when the cover plate of electrolytic cell is made, and it needs to be shut down for overhaul.Working conditions improved after replacement of TA10, However, the wet chlorine environment is still difficult to maintain a service cycle of more than three years, TA9 titanium palladium alloy plate, Corrosion problems are effectively mitigated, The corrosion rate of TA9 in boiling 5% hydrochloric acid is only 1/500 of that of TA2.

TA9 is Ti‑0.2Pd alloy., High corrosion resistant titanium alloy grade in chemical industry, It is easy for many buyers to confuse it with TA10 titanium molybdenum nickel alloy.TA9 adds palladium element to adapt to reducing acid, high temperature chloride and wet chlorine coexistence conditions;TA10 Depends on molybdenum, nickel element enhance corrosion resistance, It is more inclined to common crevice corrosion scenario containing chloride ions., The composition of the two is different from that of corrosion resistance, They are not interchangeable.According to GB/T 3620.1 standard, TA9 palladium content is controlled at 0.12‑0.25%, corresponding to American standard Grade7, UNS number R52400.Palladium plays a role in cathode modification, Self-repair of passivation film promoted in oxygen-poor crevice environment, Significantly increase reducing acid, pitting, Crevice corrosion resistance.

TA9 is mostly used in chlor-alkali electrolytic cells, hydrochloric acid dilute sulfuric acid evaporator, MSF Seawater Desalination Plant, wet chlorine pipeline, geothermal high chlorine fluid, Nuclear power secondary circuit auxiliary equipment.When reducing acid, high temperature chloride and crevice pitting risk occur at the same time under working conditions, TA9 shall be given priority.It is necessary to distinguish that TA2 passivation film is easy to be destroyed in reducing acid environment;TA10 performs reasonably well under normal chloride conditions, But wet chlorine, The corrosion resistance under boiling reducing acid condition is inferior to TA9.

At the price level, because of the influence of precious metal palladium, the price of TA9 plate is significantly higher than that of ordinary titanium.Thin 2‑4mm annealed plate market reference 1000‑1250 yuan per kg, 4‑10mm medium plate about 900‑1100 yuan per kg, the market follows palladium metal price fluctuations.Inquiries suggest clarifying palladium price fluctuation rules, or locking furnace batches to avoid delivery risks caused by raw material price increases.Simple reference for type selection: coexistence of dilute hydrochloric acid, dilute sulfuric acid and wet chlorine is preferred to TA9;Medium temperature chloride crevice corrosion only, budget limited can evaluate TA10;TA9 is preferred for thin-wall welds and pressure critical equipment to ensure safety redundancy.

TA9 unit price is high, there is a risk of material confusion in the market, and the received materials can be verified at four points.The first check quality assurance certificate and furnace batch record, confirm that the measured palladium content falls within the range of 0.12‑0.25%;secondly, XRF spectrum detection is used to identify the characteristic peak of palladium element;Third, focus on the distribution of palladium, Key pressure-bearing parts priority primary titanium sponge with master alloy melting products, Third-party inspection reports can be requestedThe stamp can only be used as an aid and cannot be used alone to determine the brand.

There are three points to note in welding processing, Argon protection to avoid oxidation, Control heat input, Palladium segregation prevention, After welding, pickling passivation is done to restore corrosion resistance. Titanium manufacturers rooted in Baoji China titanium valley can provide TA9 titanium palladium alloy plate, Support for third-party component detection, Furnace batch information is complete and traceable, engineer's binding medium, temperature, Pressures are given for selection reference.titanium stirrerSelection and Procurement Guide

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frequently asked questions

Q: What American standard does TA9 correspond to? A: TA9 corresponds to ASTM Grade7 (UNS R52400), note that it is distinguished from Grade11, and there is a difference in the palladium content control range between the two.

Q: Can TA9 be replaced with TA10? boiling hydrochloric acid, Wet chlorine superimposed crevice corrosion condition, TA10 corrosion resistance performance can not reach TA9 level, Direct replacement is not recommendedOnly moderate temperature chloride crevice scenario, TA10 can be evaluated for cost optimization.

Q: What are the precautions for TA9 welding? Argon protection for welding, Controlling Heat Input to Prevent Palladium Segregation, Passivation Recovery by Acid Pickling after Welding, It is recommended that welders with experience in titanium alloy processing should operate.

Q: How to do TA9 incoming acceptance? Check the warranty certificate and furnace batch number, detect palladium element content by spectrum, Important parts View third-party piece-by-piece inspection reports, The stamp is only used as an auxiliary certificate.

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.TA9 material prices by palladium precious metal market dynamic fluctuations, the actual quotation to order the day the market prevail;Material selection under severe corrosion conditions, It is recommended that qualified engineers and technicians combine the site conditions, Comprehensive evaluation of GB/T 3620.1 and other standards.