Salt spray corrosion testing is a key method for evaluating the corrosion resistance of metal materials, protective coatings, electronic components, automotive parts, and outdoor equipment. Choosing the right test chamber directly affects test data compliance, testing efficiency, and the long-term operating and maintenance costs of the laboratory.

BEVS has been specializing in coatings and weathering testing for many years. BEVS Intelligent Multifunctional Salt Spray Tester series features a modular design and industrial-grade control system, offering a range of options to meet different corrosion testing requirements.

Taking BEVS Intelligent Multifunctional Salt Spray Tester as an example, this article provides a practical and systematic guide to selecting the right chamber for laboratories and quality control departments across various industries. The guide focuses on five key aspects: test function requirements, chamber capacity and specifications, industry application, core hardware and standards, and compliance and maintenance support.

 Select the Equipment Series Based on Test Requirements

Based on the applicable test standards and test conditions, salt spray test chambers can generally be divided into four categories: basic, cyclic, combined cyclic, and multifunctional models. Each type is designed for specific testing requirements and standards, so the first step in selecting the right chamber is to identify the type of test to be performed.

1. Basic Salt Spray Test Chamber (Salt Spray Only)

△ One-piece FRP chamber construction

1) Key Functions

Designed specifically for constant salt spray testing, with no drying, humidity control, or water spray functions. It supports basic NSS (Neutral Salt Spray), AASS (Acetic Acid Salt Spray), and CASS (Copper-Accelerated Acetic Acid Salt Spray) testing.

2) Applicable Standards

GB/T 10125, ISO 9227, and ASTM B117 — applicable to standard salt spray testing only.

3) Applicable Industries and Applications

Suitable for small hardware fasteners, standard electroplated parts, incoming inspection of coated materials, and comparison of individual corrosion protection processes. Ideal for production quality control environments where only continuous static salt spray testing is required, with no need for dry/wet cycling or humidity/heat cycling.

4) Recommended Models

BEVS 3320 (800 L) and BEVS 3620 (1,200 L)

5) Key Specifications

• Salt spray collection rate: 1–2 mL/h/80 cm² 
• Chamber temperature range: ambient temperature to 50°C, ±1°C 
• One-piece FRP construction for the chamber body and cover 
• Simple structure with low purchase and maintenance costs

2. Cyclic Salt Spray Test Chamber (Salt Spray + Drying)

△ 10-inch HMI touchscreen

1) Key Functions

Combines salt spray and hot-air drying functions, with programmable salt spray–drying cycles to simulate the alternating wet and dry conditions found in coastal environments.

2) Applicable Standards

ASTM G85 cyclic corrosion testing, GB/T 2423.18 cyclic salt spray testing, and basic cyclic corrosion testing standards for automotive components.

3) Applicable Industries

Suitable for traditional automotive metal structural components, photovoltaic mounting systems, outdoor hardware, and small marine components. Ideal for accelerated corrosion testing that simulates natural wet/dry cycles, without the need for high-humidity exposure or fresh-water/salt-water spray testing.

4) Recommended Models

BEVS 3330 (800 L) and BEVS 3630 (1,200 L)

5) Key Specifications

Built-in heating system with a chamber temperature range of ambient temperature to 65°C (±1°C), with automatic switching between salt spray and drying cycles.

3. Combined Cyclic Salt Spray Test Chamber (Salt Spray + Drying + Temperature & Humidity)

△ BEVS 3310 with an external air-conditioning system

1) Key Functions

Fully integrated testing capabilities, including salt spray, hot-air drying, temperature and humidity control (20%–95% RH), and static exposure cycles. It supports up to 20 customizable test steps, allowing different environmental conditions to be combined in any sequence to simulate complex marine climates. An optional external air-conditioning unit is available for rapid temperature and humidity transition testing.

2) Applicable Standards

GB/T 31588.1, ISO 6270-2, ISO 11997-1, as well as stringent combined cyclic corrosion testing standards for automotive applications and marine environmental testing standards for military applications.

3) Applicable Industries

Suitable for new energy vehicle battery, motor, and electrical systems, automotive components, avionics, precision electroplated decorative parts, and R&D validation of high-end equipment for export markets. Ideal for R&D laboratories and third-party testing laboratories that require multi-stressor corrosion testing.

4) Recommended Models

BEVS 3310 (800 L) and BEVS 3610 (1,200 L)

5) Key Specifications

Built-in heating and humidification systems with closed-loop temperature and humidity control throughout the test process. Humidity fluctuation is ≤ ±5%, and temperature uniformity is ≤ ±1°C, meeting the requirements for high-precision combined cyclic corrosion testing.

4. Multifunctional Salt Spray Test Chamber (Salt Spray + Drying + Temperature & Humidity + Spray)

△ BEVS 3312 with Spray Module

1) Key Functions

Building on the full functionality of the BEVS 3310, this model also features fresh-water and salt-water spray systems. It supports acid rain simulation, salt spray wash-off testing, and combined condensation testing, providing a comprehensive solution for a wide range of environmental corrosion testing applications.

2) Applicable Industries

Suitable for automotive OEM laboratories, outdoor lighting, railway and transit equipment, electroplated bathroom fixtures, and outdoor coating applications requiring rainwater wash-off and corrosion resistance testing.

3) Recommended Models

BEVS 3312 (800 L) and BEVS 3612 (1,200 L)

4) Key Specifications

Built-in relative humidity control and spray modules, with closed-loop temperature and humidity control throughout the test process, supporting high-precision combined cyclic corrosion testing.

Select the Chamber Capacity Based on Sample Size and Test Volume

△ Racks / Hanging Rods

BEVS offers two standard chamber sizes: 800 L (3310 series) and 1,200 L (3610 series). The appropriate chamber size should be selected based on the number of samples tested at one time, maximum sample dimensions, and sample placement method (flat placement on racks or suspension from hanging rods).

1. 800 L Capacity (BEVS 3310/3320/3330/3312)

• External dimensions: 2,050 × 1,140 × 1,550 mm; internal chamber dimensions: 1,100 × 800 × 730 mm 
• Maximum sample size: 690 × 450 × 500 mm, suitable for most small- and medium-sized components and standard test panels 
• Load capacity and configuration: 12 rack levels with a total load capacity of 60 kg, and 16 hanging positions with a total load capacity of 50 kg. Up to 192 standard test panels (150 × 70 mm) can be accommodated in a single test. 
• Recommended applications: Quality control and R&D laboratories at small and medium-sized companies, as well as small third-party testing laboratories. Suitable for testing batches of up to 200 standard test panels, with no requirement for testing large complete assemblies.

2. 1,200 L Capacity (BEVS 3610/3620/3630/3612)

• External dimensions: 2,380 × 1,250 × 1,560 mm; internal chamber dimensions: 1,700 × 800 × 800 mm 
• Load capacity and configuration: 16 rack levels with a total load capacity of 70 kg, accommodating up to 288 standard test panels in a single test. Suitable for large samples such as bumpers, large sheet-metal components, and battery modules. 
• Recommended applications: Ideal for large automotive OEMs, leading EV and battery manufacturers, large electroplating and coating facilities, and major third-party testing laboratories, particularly for high-volume testing and corrosion validation of large components and complete assemblies.

Key Hardware Selection Criteria (Mandatory Compliance Requirements)

1. Corrosion-Resistant Chamber Construction

All models feature a seamless, one-piece FRP chamber and cover, combined with acid- and alkali-resistant PVC piping. Unlike conventional welded PP chambers, this design helps prevent leaks and cracking during long-term exposure to salt spray and acidic test conditions. It also offers excellent durability during long-term CASS (Copper-Accelerated Acetic Acid Salt Spray) testing, reducing the risk of corrosion and material degradation and supporting long-term measurement stability in accredited laboratories.

2. Salt Spray Deposition Uniformity System (Critical for Measurement Accuracy)

• Standard deposition rate: 1–2 mL/h/80 cm², with automatic spray pressure adjustment between 0.1 and 0.2 MPa. 
• Adjustable multi-directional nozzle assembly: The nozzle can be mechanically adjusted in multiple directions, including left/right and front/back. Five sets of collection funnels and graduated cylinders are used to verify and calibrate deposition across the chamber. The resulting deposition uniformity complies with the JJF 2168 calibration specification, helping minimize uneven corrosion and test-data deviations commonly associated with salt spray testing. 
• Three-stage air filtration and pressure regulation system: Maintains a stable inlet air pressure of 0.6–0.7 MPa and prevents oil, water, and other contaminants from entering the spray system.

3. Smart Control System and Data Compliance

1) 10-inch MCGS industrial touchscreen with multilingual support (Chinese, English, and Russian), an imported PLC-based control system, and support for up to 20 customizable test programs with programmable cycle and step-sequencing logic.

2) Full-process data logging: Real-time temperature and humidity, spray pressure, test duration, and alarm logs are automatically recorded and stored. Data can be exported via a USB flash drive, supporting laboratory data traceability and audit requirements.

3) Three-level user access control: Separate access levels for operators, maintenance personnel, and administrators. Changes to critical parameters are automatically logged, supporting compliance with ISO/IEC 17025 laboratory management requirements.

4) Multiple safety protection features: Includes an emergency-stop safety circuit, chamber-door interlock, over-temperature shutdown and alarm, automatic water replenishment, and exhaust/drainage line monitoring. These features provide automatic protection against operator errors and help minimize safety risks associated with corrosive media leakage.

5) Automated Water Management

Fully automatic deionized water filling eliminates the need for frequent manual refilling. The system includes an automatic water-change reminder after 1,000 hours of operation, reducing routine maintenance workload. A titanium corrosion-resistant heater minimizes the risk of rust and scale buildup that could block the system.

4. Key Considerations for Laboratory Operation and Maintenance

• Water Supply: Use deionized water with a conductivity of <2 μS/cm and a water pressure of 0.1–0.2 MPa. Make sure the purified-water supply line is properly planned and installed in advance.
• Air Supply: The air compressor should provide a stable pressure of 0.6–0.7 MPa, with sufficient airflow to meet the requirements of the selected chamber.
• Piping Installation: The exhaust and wastewater drainage lines must be properly routed to the outside and kept clear at all times. Do not block or obstruct these lines, as this could allow corrosive fumes or wastewater to damage electrical equipment in the laboratory.
• Routine Maintenance: Clean the saturation tower, chamber, and salt solution tank monthly to remove scale and residue. If the chamber is not used for more than 7 days, completely drain and clean the system. When selecting a chamber, consider models with fully automated water management to reduce manual maintenance and cleaning requirements.

5. Selection Summary

Define the test requirements first, then select the chamber capacity:
Start by choosing the appropriate basic, cyclic, combined cyclic, or multifunctional model based on the applicable test standards. Then select an 800 L or 1,200 L chamber according to sample dimensions and test volume.

• Prioritize compliance-critical hardware:
  A one-piece FRP chamber, adjustable multi-directional nozzle assembly, and PLC-based programmable control and data-logging system are key requirements for laboratory measurement and customer audits. Avoid compromising on these essential features.
• Choose a system that meets your long-term application needs:
  For R&D laboratories and third-party testing organizations, the full-featured BEVS 3310/3612 series is recommended. For basic quality control in production environments, the more economical BEVS 3320 offers a cost-effective solution with a lower initial investment.
• Choose a manufacturer with strong after-sales support and training:
  BEVS provides comprehensive operator training, calibration services, and lifetime maintenance support to help ensure long-term equipment stability and reliable corrosion test results. This provides standardized support for optimizing corrosion protection processes and meeting export certification requirements.

For customized laboratory solutions, technical specification comparisons, or on-site demonstrations, please contact our technical sales team for a tailored recommendation.

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