1. When Handling Seawater or High-Salinity Fluids
1.1 Seawater Heat Exchange Systems
Seawater contains large amounts of chloride ions, which can cause pitting corrosion and crevice corrosion in stainless steel plates during long-term operation. Titanium forms a stable passive oxide film on its surface, providing excellent resistance to seawater corrosion. Therefore, titanium plates are often a preferred option for seawater cooling, desalination, and marine engineering applications.
1.2 High-Salinity Industrial Wastewater
Some industrial wastewater contains high concentrations of salts and chloride ions, which may accelerate the corrosion of stainless steel plates. Titanium generally offers better corrosion resistance in many chloride-containing environments, helping reduce the risk of plate perforation and leakage. However, its suitability must still be evaluated based on the wastewater's chemical composition, temperature, and concentration.
1.3 Brine Cooling Systems
In refrigeration, industrial cooling, and certain chemical production processes, brine may have relatively strong corrosive properties. When conventional stainless steel plates are used, particular attention should be paid to the risk of localized corrosion caused by chloride ions. For applications with a high corrosion risk, titanium plates can be considered to improve equipment reliability.
1.4 Industrial Equipment in Coastal Areas
Industrial equipment in coastal regions frequently uses seawater or other salt-containing fluids for cooling. Due to their corrosive properties, these fluids can affect the service life of heat exchanger plates. Using titanium plates can improve resistance to seawater corrosion and reduce maintenance and replacement requirements caused by plate corrosion.
2. When Handling Fluids Containing Chloride Ions
2.1 High-Concentration Chloride Solutions
Chloride ions are one of the major factors contributing to pitting corrosion and stress corrosion cracking in stainless steel. When chloride concentrations are high, the corrosion risk of 304 and 316 stainless steel may increase significantly. Titanium generally provides better resistance to chloride-induced corrosion and is suitable for high-chloride environments when its compatibility with the specific operating conditions has been verified.
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2.2 Heat Exchange Involving Chloride Solutions
Various chloride solutions need to be heated or cooled during chemical production processes. These solutions may cause different degrees of corrosion in conventional metallic materials. When selecting titanium plates, the specific type of chloride compound, concentration, temperature, and oxidation-reduction conditions should all be considered.
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2.3 Chloride-Containing Cooling Water Systems
Some industrial cooling water systems use treated water containing chloride compounds as the cooling medium. Long-term operation may cause corrosion problems in stainless steel plates. This is particularly important when chloride concentrations are high, temperatures are elevated, or water quality fluctuates significantly. If 316 stainless steel cannot provide sufficient corrosion resistance, titanium plates can be further evaluated.
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2.4 Chemical Process Fluids Containing Salts
Some chemical process fluids contain multiple salts and corrosive ions, resulting in more complicated corrosion behavior than that of single-salt solutions. Titanium offers good corrosion resistance in many such environments, but it is not resistant to every chemical substance. Before selecting titanium plates, a complete chemical compatibility assessment should be carried out, and corrosion testing may be necessary.
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3. When Handling Chlorine and Chlorine-Containing Oxidizing Fluids
3.1 Wet Chlorine and Chlorine-Containing Water
Titanium has excellent corrosion resistance to wet chlorine and can therefore be used in certain chlor-alkali and chlorine-related heat exchange systems. In chlorine production, treatment, and related chemical processes, titanium plates can reduce the corrosion risks associated with conventional stainless steel. However, it is important to distinguish between wet chlorine and dry chlorine, as titanium is not suitable for every chlorine-containing environment.
3.2 Hypochlorite Solutions
Some industrial water treatment and chemical production processes use oxidizing solutions such as sodium hypochlorite. These solutions have oxidizing properties and may cause corrosion in conventional stainless steel plates. Titanium offers good corrosion resistance under many of these conditions, but its suitability must be evaluated according to the solution concentration, temperature, and actual operating conditions.
3.3 Chlor-Alkali Production Processes
The chlor-alkali industry involves brine electrolysis, chlorine handling, and the heating and cooling of related chemical fluids. Some process fluids are highly corrosive and place demanding requirements on heat exchanger plate materials. Titanium plates can be used in brine and certain wet-chlorine-related applications after material compatibility has been verified, helping improve corrosion resistance.
3.4 Process Fluids Containing Oxidizing Salts
Certain industrial solutions contain oxidizing salts or other corrosive substances that may cause significant corrosion in conventional metal materials. Titanium remains stable in many oxidizing environments and can be considered as a candidate material for heat exchanger plates. However, its suitability should not be determined solely by whether the fluid is oxidizing. The complete chemical composition must also be analyzed.
4. In Marine Engineering and Ship Cooling Systems
4.1 Marine Seawater Cooling Systems
Ships commonly use seawater to cool engines, lubricating oil, and other equipment. Chloride ions and other salts in seawater may cause localized corrosion in conventional stainless steel plates. Titanium plates can improve corrosion resistance in seawater environments and reduce the risk of equipment leakage.
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4.2 Offshore Platform Heat Exchange Systems
Offshore oil platforms and other marine facilities generally require cooling equipment that can operate reliably for extended periods. Due to the highly corrosive marine environment, heat exchanger plates must provide excellent resistance to seawater corrosion. Titanium plates are suitable for seawater cooling applications when their compatibility with the operating conditions has been verified, helping reduce corrosion-related maintenance and equipment downtime.
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4.3 Seawater Desalination Equipment
During seawater desalination, raw seawater, concentrated brine, and desalinated water have different chemical properties. Concentrated brine, in particular, may contain higher salt and chloride concentrations, placing greater demands on material corrosion resistance. Titanium plates can be used in suitable heat exchange stages where their corrosion resistance meets the operating requirements.
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4.4 Coastal Power Plant Cooling Systems
Some coastal power plants use seawater as a cooling medium, requiring heat exchange equipment to withstand long-term exposure to seawater and its corrosive effects. Conventional stainless steel plates may experience pitting or crevice corrosion under certain seawater conditions. Titanium plates provide excellent seawater corrosion resistance and are therefore commonly used in related cooling equipment at coastal power plants.
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5. When Operating at High Temperatures in Chloride-Containing Environments
5.1 High-Temperature Chloride-Containing Water
As fluid temperature increases, the corrosion behavior of metallic materials may change. The risk of pitting corrosion and stress corrosion cracking in conventional stainless steel may also increase. In high-temperature water systems containing chloride ions, titanium plates can be considered if 316 stainless steel cannot provide sufficient corrosion resistance. The applicable operating temperature must be evaluated according to chloride concentration, fluid composition, and titanium grade.
5.2 High-Temperature Brine Heat Exchange Systems
Some chemical, salt-processing, and industrial cooling processes require brine to be heated or cooled. High temperatures combined with high salt concentrations may increase the corrosion risk for heat exchanger plates, meaning conventional stainless steel may not provide sufficient long-term protection. Titanium plates can be considered for these applications, but their resistance to crevice corrosion and stress-related damage must be carefully evaluated under the actual operating conditions.
5.3 Applications with Significant Temperature Fluctuations
In some industrial systems, fluid temperatures change considerably during startup, shutdown, or load adjustments. Temperature fluctuations may affect fluid corrosivity and increase the risk of localized corrosion in unsuitable materials. For chloride-containing fluids, titanium plate compatibility should be evaluated based on the maximum operating temperature and abnormal operating conditions, rather than the normal operating temperature alone.
5.4 Equipment Requiring Long-Term Continuous Operation
Some industrial heat exchange systems must operate continuously, and corrosion-related leakage can interrupt production and increase maintenance costs. If the fluid presents a significant chloride corrosion risk, titanium plates can improve the long-term corrosion resistance of the equipment. For these applications, material selection should focus on long-term operating conditions rather than initial purchasing costs alone.
6. When Long Service Life and Operational Reliability Are Required
6.1 Reducing the Risk of Plate Corrosion
Plate corrosion may cause localized perforation, allowing fluids from the hot and cold sides to mix and affecting normal system operation. Titanium plates have a stable passive film on their surfaces, which helps reduce corrosion risks in suitable environments. Therefore, titanium plates offer long-term advantages in heat exchange systems handling highly corrosive fluids.
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6.2 Reducing Maintenance and Replacement Frequency
When a heat exchanger continuously handles corrosive fluids, conventional stainless steel plates may require frequent inspection, replacement, or repair. Titanium plates offer good corrosion resistance under suitable operating conditions and can reduce maintenance requirements caused by plate corrosion. However, actual maintenance intervals are also affected by gasket aging, fouling, and operating conditions.
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6.3 Reducing Losses Caused by Fluid Leakage
In industries such as chemical processing, marine engineering, and food production, heat exchanger leakage may cause fluid contamination, product quality problems, or production interruptions. For highly corrosive fluids, titanium plates can reduce the possibility of corrosion-related plate perforation. This is particularly important in processes where fluids on the hot and cold sides must remain completely separated.
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6.4 Improving Long-Term Equipment Stability
During long-term operation, plate heat exchangers are exposed to fluid corrosion, temperature changes, and fluid erosion. Titanium plates offer good stability in compatible chemical environments, helping improve long-term equipment reliability. However, titanium plates cannot prevent every type of equipment failure. Proper flow channel design, operating parameter control, and regular inspections are still necessary.
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7. When Titanium Plates Offer Better Long-Term Economic Value
7.1 Comparing Initial and Long-Term Costs
Titanium plates generally cost more than 304 and 316 stainless steel plates, resulting in a higher initial equipment investment. However, when handling highly corrosive fluids, conventional stainless steel plates may require frequent maintenance or premature replacement. By comparing purchasing costs, maintenance expenses, and equipment service life, titanium plates may offer better long-term economic value.
7.2 Reducing Equipment Downtime Costs
For chemical plants, power plants, and seawater treatment facilities operating continuously, equipment downtime can result in significant financial losses. If plate corrosion causes leakage, additional time will be required for repairs and system restart. Using titanium plates that are suitable for the operating conditions can reduce the risk of corrosion-related failures and minimize unplanned downtime.
7.3 Applications with High Maintenance Costs
Some industrial heat exchangers are installed in locations where dismantling, inspection, and plate replacement require considerable labor and time. If conventional stainless steel plates cannot meet the corrosion resistance requirements, frequent maintenance may increase the total lifecycle cost of the equipment. For these projects, titanium plates can be considered to improve long-term equipment value.
7.4 Systems with High Reliability Requirements
In marine engineering, chemical production, and large-scale industrial cooling systems, heat exchangers are often important components of the overall production process. Equipment failure may affect the operation of the entire system, making material reliability particularly important. When corrosion risks are high and downtime is costly, titanium plates may be a more reasonable choice.
8. Important Considerations Before Using Titanium Plates
8.1 Titanium Is Not Suitable for Every Corrosive Fluid
Although titanium offers excellent corrosion resistance, it is not suitable for all acids, alkalis, and chemical solutions. For example, hydrofluoric acid and certain strongly reducing acids can cause severe corrosion of titanium. For fluids such as sulfuric acid and hydrochloric acid, compatibility must be evaluated according to their concentration, temperature, and chemical conditions. Titanium should never be assumed suitable without proper assessment.
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8.2 Selecting the Appropriate Titanium Grade
Different titanium grades have different mechanical strengths, corrosion resistance properties, and application ranges. Common commercially pure titanium grades include Grade 1 and Grade 2. The appropriate grade should be selected according to fluid composition, operating temperature, and equipment design requirements. For certain special high-temperature or highly corrosive applications, titanium-palladium alloys may also need to be evaluated.
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8.3 Considering Gaskets and Other Components
A plate heat exchanger requires not only suitable plate materials but also compatible gaskets, connections, and other components. Different fluids have different compatibility requirements for gasket materials such as EPDM, NBR, and FKM. Upgrading the plate material while ignoring the compatibility of other components may lead to equipment problems. All fluid-contacting components must be properly matched to ensure reliable operation.
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8.4 Providing Complete Operating Parameters
When consulting a heat exchanger supplier about titanium plate configurations, customers should provide the names and chemical compositions of both hot-side and cold-side fluids, chloride concentrations, and pH values. Other necessary information includes inlet and outlet temperatures, operating pressure, flow rate, and required heat duty. Special cleaning chemicals, temperature fluctuations, and long-term shutdown conditions should also be specified to help the supplier select suitable materials and design the equipment correctly.
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