Research on Structural Design and Intelligent Control Technology of Salt Spray Chambers

Abstract

Salt spray corrosion is a major environmental factor affecting the service life and reliability of metal, coating, electrical and electronic products. As the core equipment for accelerated artificial corrosion testing, salt spray chambers directly determine the credibility of test data due to their box corrosion resistance, temperature control accuracy, spray uniformity and intelligent level. Taking the LISUN YWX/Q-010 salt spray chamber as the research object, this paper systematically analyzes the technical advantages of its integrated box made of imported anti-corrosion PP plates without welding gaps and leakage prevention, high-precision temperature control system and automatic spray device. It explains the principles of three mainstream test modes including Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS) and Copper-Accelerated Acetic Acid Salt Spray (CASS). Meanwhile, it introduces intelligent functions such as automatic salt spray sedimentation monitoring, timing test control (0~9999h), acousto-optic alarm for water shortage and over temperature. Combined with the comparison of key parameters, it is verified that the equipment can cover laboratory small sample testing and mass production line product verification. It meets domestic and international standards such as GB/T, ISO, ASTM and IEC, providing stable and reliable test support for material selection, process optimization and reliability certification.

Introduction

In coastal climates, coastal industrial areas and high-humidity & high-salt environments, metal parts, plating layers, coatings and electronic equipment are prone to rusting, blistering, poor contact and insulation failure, which seriously threaten product safety and service life. The cycle of traditional natural exposure tests lasts for months or even years, failing to meet the needs of rapid R&D and quality control in modern industry. By artificially simulating high-concentration salt spray environments to accelerate the corrosion process, salt spray chambers can evaluate the corrosion resistance of materials and products within hours to thousands of hours, and have become essential reliability testing equipment in industries such as electronics, hardware, coatings, household appliances and new energy.

Most salt spray equipment on the current market has common defects such as welding box leakage, uneven temperature, unstable spray drift and low intelligence, resulting in poor test repeatability and distorted data. The LISUN YWX/Q-010 salt spray chamber has been upgraded in structural materials, thermal systems, spray mechanisms and intelligent control. It adopts an integrated seamless forming design with imported anti-corrosion PP plates, matched with a high-precision PID temperature control system and automatic tower spray device, to stably realize three standard tests of NSS, AASS and CASS. Equipped with automatic salt spray sedimentation monitoring, 0~9999-hour timing and acousto-optic alarms for water shortage and over temperature, it can satisfy accurate verification of laboratory small samples and rapid testing of mass products on production lines, fully adapting to salt spray corrosion testing demands in multiple industries and scenarios.

Figure: Salt mist test chamber

Core Structure and Material Advantages of Salt Spray Chambers

Integrated Forming Box with Imported Anti-Corrosion PP Plates (No Welding Gaps)
The box of LISUN YWX/Q-010 salt spray chamber adopts an integral forming process with imported anti-corrosion PP plates without welding or splicing gaps, completely solving the pain points of easy leakage and corrosion cracking of traditional welded boxes in structure. PP plates feature excellent resistance to acid, alkali, salt spray and aging. They will not embrittle, deform or contaminate test solutions under long-term high-concentration salt spray and high humidity environments, ensuring a pure and stable test environment.

Advantages of integrated forming structure:
• Zero leakage: no weld gaps and aging risks of sealant, preventing leakage of salt water and condensed water to protect the laboratory environment and surrounding equipment.
• Strong corrosion resistance: long-term resistance to erosion of various test solutions such as sodium chloride, acetic acid and copper chloride.
• Easy maintenance: smooth inner wall without dead corners, reducing salt crystal residue and ensuring test consistency.
• Stable structure: high integral strength, no deformation under high temperature and high humidity, and stable internal air field.

High-Precision Temperature Control System
The equipment is equipped with an independent dual-channel high-precision temperature control system, which separately controls the temperature of the test chamber and saturation barrel. With a uniform heating air duct, it realizes rapid temperature stabilization and uniform temperature field distribution. The temperature uniformity is ≤2℃ and the temperature fluctuation is ≤±0.5℃, fully complying with GB/T 10125, ASTM B117 and other standard requirements.

Automatic Spray Device
The tower-type automatic spray device is adopted, equipped with quartz glass nozzles and two-stage pressure-stabilized air source treatment to realize continuous spray, intermittent spray and programmable cyclic spray. The nozzle is anti-crystallization and anti-blocking with fine and uniform mist particles. The salt spray sedimentation rate is stably controlled at 1~2ml/80cm²/h, with automatic sedimentation monitoring to eliminate manual measurement errors.

Three Mainstream Salt Spray Test Modes

The LISUN YWX/Q-010 salt spray chamber can stably carry out three mainstream corrosion test modes:3.1 Neutral Salt Spray (NSS)
Sodium chloride solution with a concentration of 5%±0.5% and pH value of 6.5~7.2. It is the most universal basic test for conventional corrosion resistance evaluation of steel, galvanized parts and coating materials.

Acetic Acid Salt Spray (AASS)
Mixed solution of 5% sodium chloride and acetic acid with pH adjusted to 3.1~3.3, used for accelerated corrosion testing of high-standard coatings and aluminum alloy products.

Copper-Accelerated Acetic Acid Salt Spray (CASS)
Mixed solution of sodium chloride, copper chloride and acetic acid with strong corrosion intensity. It is widely used for rapid reliability screening of high-end electroplating parts, automotive parts and bathroom hardware.

Intelligent Functions and Safety Protection

To improve operation convenience and test safety, the YWX/Q-010 salt spray chamber is equipped with multiple intelligent configurations:
• Long-distance timing control: adjustable from 0 to 9999 hours, supporting unattended long-term tests.
• Automatic salt spray sedimentation monitoring: real-time collection and stable adjustment to ensure consistent test conditions.
• Multi-channel acousto-optic alarm: automatic alarm for water shortage, over temperature and low air pressure to avoid test interruption.
• Dual over-temperature protection: mechanical and electronic dual protection to eliminate potential safety hazards.

Key Specification Parameter Table

Application Scenarios: From Laboratory Small Samples to Mass Production Line Verification

With stable performance and flexible configuration, the LISUN YWX/Q-010 salt spray chamber covers full-scenario application demands. In laboratories, it is applicable to small-batch sample testing, material formula comparison and process optimization. In production workshops, its large-capacity chamber meets batch sampling inspection and factory verification of hardware parts, auto parts and household appliance accessories. Compliant with multiple international standards, it supports third-party testing and export certification, serving multiple industries including new energy, outdoor equipment and precision electronics.

Conclusion

Salt spray chambers are indispensable core equipment for evaluating the corrosion resistance of industrial products. The LISUN YWX/Q-010 salt spray chamber adopts an integrated leak-proof box structure with imported anti-corrosion PP plates without welding gaps. Combined with a high-precision temperature control system and automatic spray device, it perfectly realizes three mainstream test modes of NSS, AASS and CASS. Equipped with intelligent functions such as automatic sedimentation monitoring and multi-safety alarm, it greatly improves automation and operation safety. It can not only meet high-precision R&D testing in laboratories, but also support mass product verification on production lines. With accurate test data, stable operation and low maintenance cost, it provides professional and efficient environmental simulation testing solutions for enterprise quality control, product R&D and global market certification