Heat exchangers in industrial settings face severe corrosion challenges, with exposure to aggressive media causing material degradation rates of up to 2.5mm/year in carbon steel components. These conditions are particularly acute in systems handling process fluids with pH variations, high chloride content, and operating temperatures exceeding 150°C, where traditional materials struggle to maintain structural integrity.

The fundamental challenge lies in balancing corrosion resistance with thermal conductivity—protective coatings and noble materials often introduce thermal barriers that reduce heat transfer efficiency.

This page brings together solutions from recent research—including integrated PFA/PPS coating systems, dual-layer polyethylene micaceous iron treatments, pH-regulated protective mechanisms, and advanced geometrical designs for harsh environments. These and other approaches focus on maintaining thermal performance while extending service life in aggressive industrial environments.

1. Heat Exchanger with Integrated PFA and PPS Coatings on Heat Exchanger Tube Surfaces

SINOCHEM LANTIAN FLUORINE MATERIALS CO LTD, SINOCHEM LANTIAN CO LTD, Sinochem Bluestar Co., Ltd., 2023

A corrosion-resistant heat exchanger comprising a heat exchanger body with integrated PFA anti-corrosion coating on the outer surface of the heat exchanger tube and PPS plastic coating on the inner surface of the heat exchanger tube. The heat exchanger body includes a head, a cylinder body, a tube sheet, a baffle plate, and a heat exchange tube. The tube sheet is connected at both ends, and the heat exchanger body has inlet and outlet ports. The PFA anti-corrosion coating is applied to the outer surface of the heat exchanger tube, while the PPS plastic coating is applied to the inner surface of the heat exchanger tube. This integrated coating system provides enhanced corrosion protection for both the tube and heat exchanger components, particularly against pitting and crevice corrosion in industrial cooling systems.

CN218973309U-patent-drawing

2. Air Conditioner Heat Exchanger with Dual-Coated Anti-Corrosion System Comprising Polyethylene Micaceous Iron and Epoxy Mic Iron Coatings

Huizhou Junanda Air Conditioning Purification Technology Co., Ltd., 2022

Anti-corrosion air conditioner design that prevents premature degradation of the heat exchanger components. The design features a dual-coated system where the inner tube and the intermediate tube are protected from corrosion by a specially formulated anti-rust coating. The coating consists of a chemical polyethylene micaceous iron anti-rust paint on the inner tube and an epoxy mic iron intermediate paint on the outer tube. The rubber outer tube provides a barrier against water ingress, while the silica gel filler in the steel intermediate tube helps to absorb moisture. This dual-coated system significantly extends the service life of the heat exchanger components, enabling the air conditioner to operate effectively in environments with high humidity and water exposure.

3. Air Conditioning System with Phase Change Boiler and pH-Regulated Alkaline Dosing Mechanism

BROAD AIR CONDITIONER CO LTD, Broad Air Conditioning Co., Ltd., 2022

A high-efficiency dew point corrosion-resistant air conditioning system that utilizes a phase change boiler, a compression cold water/heat pump unit, and a flue gas heat exchanger assembly. The system incorporates a pH detection sensor to monitor the condensate water quality and automatically adjusts the alkaline medicinal liquid dosing to maintain optimal pH levels. The system achieves superior corrosion protection through the phase change boiler's vacuum operation and the cold water/heat pump unit's compression cycle.

CN216048121U-patent-drawing

4. Fin Heat Exchanger with Corrosion-Resistant Coated Fins for High Salt Environments

SHANGHAI TECHASE ENVIRONMENTAL PROTECTION CO LTD, Shanghai Tongchen Environmental Protection Co., Ltd., 2021

Corrosion-resistant fin heat exchanger for sludge dryers that effectively manages corrosive air streams. The heat exchanger incorporates a corrosion-resistant coating on its fin surfaces, protecting against salt spray and high salt concentrations during air exchange. This design enables reliable operation in environments with high salt spray and condensed water, while maintaining efficient heat transfer through the fin structure.

5. Air Conditioning Unit with Gypsum Board Fireproof Components and Rock Wool Insulation Core

Guangdong Yashi Electrical Co., Ltd., GUANGDONG YASHI ELECTRIC APPLIANCE CO LTD, 2021

A corrosion-resistant air conditioning unit that incorporates fire-resistant gypsum board components and rock wool insulation to achieve high-temperature resistance and fire rating. The unit features gypsum board fireproof parts and rock wool insulation in the core, with thermal conductivity less than 0.04 W/m·°C, enabling both internal and external temperatures to reach 300-450°C.

6. Multi-Layered Corrosion-Resistant Air Conditioner Housing with Integrated Protective and Structural Layers

成都索邦信息技术有限公司, CHENGDU SORBONNE INFORMATION TECHNOLOGY CO LTD, 2021

An energy-efficient air conditioner housing with a long service life, featuring a corrosion-resistant, high-performance shell that combines multiple layers for enhanced durability and environmental sustainability. The shell comprises a base layer, a protective layer, a strength layer, and a heat-resistant layer, with the protective layer comprising a waterproof layer, an anti-corrosion coating, and an anti-aging coating. This multi-layered design provides comprehensive protection against environmental factors and corrosion, while maintaining the air conditioner's performance and longevity.

CN213733910U-patent-drawing

7. Corrosion-Resistant Coating Application Method for Air Conditioner Heat Exchanger Fins

MITSUBISHI ELECTRIC CORP, 2021

A method to prevent corrosion damage to air conditioner components, particularly fins, through a corrosion-resistant coating process. The method involves applying a corrosion-resistant coating to the heat exchanger components, specifically the fins, to prevent corrosion and maintain heat transfer efficiency. This coating process enables the fins to withstand corrosive environments without compromising their performance, thereby extending the lifespan of the air conditioner's heat exchanger.

8. Air Conditioner Housing with Multi-Layered Protective Coating Configuration

ZHIQIANG LV, YICHI ZHANG, Zhang Yichi, 2021

Air conditioner housing with a long service life, featuring a weather-resistant housing body with strategically positioned protective layers. The housing body features a weathering layer positioned on the top and bottom, with a corrosion-resistant layer on one side and an anti-oxidation layer on the other. This design configuration provides enhanced protection against environmental degradation, particularly against wind and rain damage, while maintaining the housing's structural integrity.

9. Aluminum Flat Tube with Multi-Layer Insulation and Anti-Corrosion Coating

新乡市锦宏科技有限公司, XINXIANG JINHONG TECHNOLOGY CO LTD, 2020

Aluminum flat tube for air conditioning with enhanced thermal performance and durability. The tube comprises a body, insulation mechanism, glass wool layer, rock wool layer, silicate layer, polyethylene layer, anti-corrosion coating, epoxy zinc layer, and copper oxide layer. The insulation mechanism is strategically positioned away from the aluminum body, while the anti-corrosion coating protects one side of the device. This design configuration addresses thermal management and corrosion protection while maintaining structural integrity.

CN210716352U-patent-drawing

10. Heat Exchanger with High-Temperature-Resistant Core and Advanced Geometrical Arrangements

Zhuzhou Sanda Electronics Manufacturing Co., Ltd., ZHUZHOU SANDA ELECTRONICS CO LTD, 2020

A heat exchanger for industrial applications that enhances reliability in harsh environments. The heat exchanger incorporates a novel design featuring a unique, high-temperature-resistant core that utilizes advanced materials and geometrical arrangements to maintain performance in extreme conditions. The design enables operation in both high-temperature and corrosive environments without compromising system integrity, thereby extending the life of the heat exchanger and its associated equipment.

CN210569327U-patent-drawing

11. Air-Conditioning Duct with Multi-Layer Composite Structure Incorporating Carbon Fiber, Polyurethane, and Aramid Fiber Layers

Hui Yanyan, HUI YAN-YAN, 2020

Air-conditioning duct with enhanced corrosion resistance and durability through the incorporation of advanced materials. The duct features a carbon fiber layer with a polyurethane coating, compounded with polypropylene and polyvinyl fluoride. The polyurethane coating protects against environmental degradation while maintaining airflow performance. The polyurethane coating is compounded with an aramid fiber layer, compounded with an antioxidant, and compounded with a heat-resistant material. The aramid fiber layer, compounded with a PVC coating, compounded with a heat-resistant material, and compounded with a cold-resistant material, provides enhanced durability and thermal performance.

CN210566772U-patent-drawing

12. Refrigeration Cycle Device with Trifluoroiodomethane and Acid-Resistant Tubular Circuit Design

HITACHI JOHNSON CONTROLS AIR CONDITIONING INC, 2020

A refrigeration cycle device that enhances environmental sustainability through the use of a refrigerant with reduced global warming potential (GWP). The device employs a refrigerant circuit where the refrigerant circulates sequentially through the compressor, condenser, expansion valve, and evaporator, with the refrigerant containing trifluoroiodomethane. The circuit's design incorporates acid-resistant tubular members with a protective film on their inner surfaces, ensuring reliable operation while maintaining the required performance characteristics.

WO2020040158A1-patent-drawing

13. Corrosion-Resistant Air Conditioning Frame with X-Shaped Support and Dual Anti-Corrosion Coatings

南京鑫美光科技实业有限公司, NANJING XINMEIGUANG SCIENCE AND TECHNOLOGY INDUSTRIAL CO., LTD., 2018

A corrosion-resistant air conditioning frame featuring a novel structural design that enhances durability and performance. The frame comprises a rear plate, a front plate with a slanted support plate, and a rubber pad on the rear side. The front plate has a slanted support plate with drainage features at the bottom and top, while the rear plate features drainage bumps. The slanted support plate has internal grooves and an X-shaped support frame with a connection block. The X-shaped frame is coated with a second anti-corrosion layer, and the frame is mounted on an inclined support plate. The frame's outer casing features a first anti-corrosion coating and a reinforced X-shaped support frame. The frame's internal cavity is filled with sound-absorbing cotton. The design combines the benefits of a conventional frame with the added protection against corrosion and moisture ingress.

CN207975759U-patent-drawing

14. Condenser with Spiral Duct Design and Integrated Humidification System

Foshan Sanshui Qiangfa Refrigeration Equipment Parts Co., Ltd., FOSHAN SANSHUI QIANGFA REFRIGERATION EQUIPMENT ACCESSORIES CO., LTD., 2018

Condenser with enhanced corrosion protection through a novel spiral structure and integrated humidification system. The condenser features a spiral duct design that enhances heat transfer while a water storage tank and humidification system facilitate optimal operating conditions. The spiral design incorporates a cooling fan and conductive ring system, while the humidification system utilizes a condensation pipe and water storage tank. The condenser's outer casing houses a power supply box connected to an external power source, with conductive rings and a conductive film wrapping the condenser tubes. This configuration provides both corrosion protection and enhanced heat transfer efficiency through the spiral design and humidification system.

CN207610597U-patent-drawing

15. Integrated Air Conditioning System with Unified Corrosion-Resistant Coating

Shanghai Highly Special Refrigeration Equipment Co., Ltd., SHANGHAI HIGHLY COOLER CO., LTD., 2018

A corrosion-resistant air conditioning system that integrates an indoor unit, outdoor unit, and connecting pipe group through a single, integrated design. The system employs an anti-corrosion layer on both the indoor and outdoor units, along with the connecting pipe group, to protect the entire system from corrosive environments. This integrated approach eliminates the need for separate components and simplifies maintenance, while maintaining the system's performance and reliability in harsh corrosive environments.

16. Marine Bilge Air Conditioning Pipe with Corrosion-Resistant and High-Strength Nacelle Bottom Sections and Integrated Silencer Casing

广州鑫摩克船舶工程有限公司, GUANGZHOU XINMOKE SHIP ENGINEERING CO., LTD., 2018

A bilge air conditioning sea water pipe for marine applications that enhances performance and reliability through advanced materials and design. The pipe features a corrosion-resistant bottom section, a high-strength nacelle bottom section, and a muffler glass wool casing that provides effective silencing during seawater transmission. The design incorporates a unique bottom section with integrated silencers, which helps to minimize energy losses during the transfer process.

17. Air Conditioner with Corrosion-Resistant Hybrid Heat Exchanger and Homogeneous Metal Radiating Fin

엘지전자 주식회사, LG Electronics Inc., 2018

Air conditioner with a hybrid heat exchanger that prevents corrosion between dissimilar metal components. The air conditioner features a heat exchanger with a radiating fin that is made of the same metal material as the heat exchanger components. The fin is designed to maintain its corrosion-resistant properties even when exposed to the refrigerant, while the heat exchanger components are made of dissimilar metals that can corrode when in contact. The design ensures reliable operation of the air conditioner while minimizing corrosion risks between dissimilar metal components.

KR101827577B1-patent-drawing

18. Cold Dryer with Integrated Heat Sink and Corrosion-Resistant Coated Heat Exchanger

GUANGZHOU SONGJING ELECTRIC CO LTD, 广州松井电气有限公司, 2018

A cold dryer with enhanced corrosion resistance that utilizes a novel heat exchanger design to mitigate high-temperature corrosion issues. The dryer incorporates a heat exchanger with an integrated heat sink and anti-corrosion coating, where the heat exchanger housing houses the heat sink. The heat sink is strategically positioned to dissipate heat generated by the heat exchanger, while the heat exchanger itself is coated with a corrosion-resistant material. This design addresses the conventional heat exchanger performance limitations and corrosion concerns associated with high-temperature applications.

CN206861906U-patent-drawing

19. Corrosion-Resistant Coating with Additive-Enhanced Acrylic Resin for Plate Heat Exchangers in Indirect Evaporative Cooling Systems

SEOBUN INDUSTRY ENGINEERING CO LTD, 서번산업엔지니어링주식회사, 2017

Corrosion-resistant coating for air conditioning systems using a novel indirect evaporative cooling configuration. The coating, comprising a water-soluble acrylic resin, incorporates specific additives to enhance corrosion protection while maintaining efficient cooling performance. The coating is applied to both sides of the plate heat exchanger surfaces, providing superior corrosion resistance compared to conventional coatings. The system features a continuous cooling loop with a built-in recovery mechanism, where the recovered cooling water is reused to maintain humidity control. This configuration enables high-performance cooling with reduced energy consumption and humidity management requirements.

20. Cryogenic Tank with Integrated Heat Exchanger and Circulation System Featuring Stainless Steel Liner

山东华昇隆太阳能科技有限公司, SHANDONG HUASHENGLONG SOLAR ENERGY TECHNOLOGY CO LTD, 2016

An air source heat pump cryogenic tank that integrates a heat exchanger and circulation system within a single tank, eliminating the need for separate components. The tank features a stainless steel liner interior, which replaces conventional stainless steel liners and provides superior corrosion resistance. The tank houses both the heat exchanger and circulation system, with the heat exchanger located within the tank itself. This integrated design enables a closed-loop system where the tank serves as both the heat exchanger and storage container, eliminating the need for separate components and reducing system complexity. The tank's closed-loop design also eliminates the risk of ice formation in outdoor pipelines during arctic temperatures, while the closed container design reduces noise generated by the system.

CN205481788U-patent-drawing

21. Plate Heat Exchanger with Coated Fins for Enhanced Scaling and Corrosion Resistance

22. Heat Exchange Coil with Fluorocarbon-Based Anticorrosion Coating on Spiral Outer Wall

23. Membrane Module with Integrated Turbulators and Alternating Components for Enhanced Convective Heat Transfer

24. Micro-Porous Membrane with Hydrophobic Surface for Turbulent Flow in Desiccant Systems

25. Marine Air Conditioning Condenser Unit with Horizontally Discharged Coil Assembly and Corrosion-Resistant Housing

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