Salt spray testing is a critical corrosion evaluation method widely used in industries such as automotive, aerospace, and electronics. To ensure accurate and repeatable test results, it is essential to prepare the salt solution correctly and use a high-quality salt spray test chamber that maintains precise testing conditions. Below are the preparation procedures for common salt spray tests, including Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), and Copper-Accelerated Acetic Acid Salt Spray (CASS):
1. Neutral Salt Spray (NSS) Solution Preparation
Prepare sodium chloride solution: Dissolve 50g of sodium chloride (NaCl) in 1L of distilled or deionized water to achieve a concentration of 50g/L ± 5g/L. Stir until completely dissolved.
Adjust pH (if necessary): Measure the pH of the solution using a pH meter. The pH should be within 6.4–7.0. If adjustment is required:
Use sodium hydroxide (NaOH) to increase pH.
Use glacial acetic acid (CH₃COOH) to decrease pH.
Note: Even small amounts of NaOH or acetic acid can significantly alter pH, so add cautiously.
For optimal performance, ensure the solution is used in a professional salt spray test chamber that provides consistent temperature, humidity, and spray distribution.
2. Acetic Acid Salt Spray (AASS) Solution Preparation
Prepare base sodium chloride solution: Same as NSS (50g NaCl per 1L distilled/deionized water).
Adjust pH: Add glacial acetic acid to the NaCl solution while stirring. Measure the pH until it reaches 3.0–3.1.
A reliable salt spray corrosion test chamber with precise pH monitoring and spray control is crucial for AASS testing, as slight deviations can affect test validity.
3. Copper-Accelerated Acetic Acid Salt Spray (CASS) Solution Preparation
Prepare sodium chloride solution: Same as NSS (50g NaCl per 1L distilled/deionized water).
Add copper(II) chloride (CuCl₂): Dissolve 0.26g/L ± 0.02g/L of CuCl₂·2H₂O (or 0.205g/L ± 0.015g/L anhydrous CuCl₂) in the NaCl solution.
Adjust pH: Add glacial acetic acid while stirring until the pH reaches 3.0–3.1.
CASS testing requires an advanced salt spray test chamber capable of maintaining strict temperature and corrosion acceleration conditions to ensure fast and accurate results.
4. Key Considerations for Salt Spray Testing
Purity requirements:
Use high-purity NaCl (≥99.5%) with ≤0.1% sodium iodide and ≤0.5% total impurities.
Avoid NaCl with anti-caking agents, as they may act as corrosion inhibitors and affect test results.
2.Filtration: Filter the solution before use to prevent nozzle clogging in the salt spray test chamber.
3.Pre-test checks:
Verify the salt concentration and solution level before each test.
Ensure the salt spray corrosion test chamber is properly calibrated for temperature, humidity, and spray uniformity.
Why Choose a Professional Salt Spray Test Chamber?
A high-performance salt spray test chamber ensures:
✔ Precise environmental control – Maintains stable temperature, humidity, and spray conditions.
✔ Corrosion resistance – Made of high-quality PP or PVC materials to withstand long-term testing.
✔ Compliance with standards – Meets ASTM B117, ISO 9227, and other industry requirements.
✔ User-friendly operation – Automated controls for consistent and repeatable test results.
For industries requiring reliable corrosion testing, investing in a high-quality salt spray test chamber is essential to achieve accurate and repeatable results.
Reliability Test
AEC-Q102 Test Certification Fixed Damp Heat with Humidity Cycling (FMG), LED lamp reliability test method (GB/T 33721-2017), Component screening Ammonia test CAF test, Flame retardant grade Cyclic corrosion test (CCT), Mechanical shock test, High pressure cooker test (PCT), Highly Accelerated Stress Testing (HAST), High and low temperature and humidity test (THB), Hydrogen sulfide test (H2S), Liquid tank thermal shock test (TMSK), Component humidity sensitive grade test (MSL), Screening for high reliability use Hot flash test + acoustic sweep screening for high reliability use (MSL+SAT), LED luminaires reliability test scheme, Vibration test (VVF), Temperature cycle/thermal shock test (TC/TS), LED red Ink test UV aging test, LED light source anti-vulcanization test, Double 85 constant temperature and humidity reliability environmental test (THB), Salt spray test check.
LED Traffic Light Test
Light-emitting Diode, referred to as LED, is the abbreviation of the English name Light Emitting Diode, through the combination of electrons and holes to release energy light, can efficiently convert electrical energy into light energy, has a wide range of uses in modern society, such as lighting, flat panel display and medical devices. With the continuous progress of technology, this electronic component from the early can only emit low-light red light to develop other monochromatic light, has been widely used in visible light, infrared and ultraviolet light, is widely used in indicators and display boards, and then extended to traffic lights. It is known as a new light source in the 21st century, with high efficiency, long life, material is not easily affected by the environment and relatively stable, with the advantages of traditional light sources can not be comparable.
The traffic on the zebra crossing is heavy every day, as the guide of the traffic rules - the traffic light is also working hard every day, because it is placed outdoors all year round, so it must accept the strict reliability test before it can work. The test conditions include: Voltage electric, failure protection, electromagnetic noise, dust and waterproof, high temperature test, vibration test, salt spray test, insulation voltage, insulation resistance test...
Note: Before other tests, LED traffic lights need to undergo dry heat tests before other tests can be carried out.
Lamp surface test: dry heat test: 60℃/24 hours/applied voltage
Failure judgment: no deformation, loosening, falling off
Temperature resistance test: 70℃(16 hours)→-15℃(16 hours)→R.T., RAMP:≦1℃/min, 2cycle, power supply
Temperature and humidity test: 40℃→RAMP:≦1℃/min→40℃/95%(24 hours), power on
Continuous switching action: 40℃/60~80%, ON(1sec)←→OFF(1sec), 10000 times
Voltage electric: 80 ~ 135V(AC), 170 ~ 270V(AC)
Failure judgment: Light intensity drift ≦20%(110V, 220V light intensity as the benchmark)
Waterproof and dustproof meet IP54 class requirements
Insulation resistance test:
Insulation resistance: 500V
Failure determination: not less than 2MΩ
Insulation withstand voltage test: 1000V/60Hz/1min(after insulation resistance test)
Light chamber test:
High temperature test: 130℃/1 hour
Failure judgment: no deformation, loosening, falling off, cracking... Etc.
Vibration test: XYZ three-way, each 12min for 36min, 10 ~ 35 ~ 10Hz sine wave, each cycle for 3min, total vibration of 2mm
Failure judgment: no deformation, loosening, falling off, cracking, and the LED light surface can be normally lit and operated
Wind tunnel test: Wind speed 16 (51.5-56.4m /s), forward (0 degrees) and side (45 degrees), each blowing for 2 hours
Failure judgment: no deformation, loosening, falling off, cracking
Salt spray test: 96 hours
Failure determination: less than 8 embroider points on the area of 10,000mm^2, LED signal light surface insulation resistance >2MΩ, voltage 1000V/1min, no abnormality
Recommended model 1: high temperature and high humidity test chamber
High temperature and high humidity test chamber is suitable for electrical, electronic, instruments and other products, parts and materials in high and low temperature alternating wet and hot environment storage, transportation, use adaptability test; It is a reliability test equipment for all kinds of electronic, electrical, electrical, plastic and other raw materials and devices to carry out cold resistance, heat resistance, wet resistance, dry resistance test and quality control engineering; Especially suitable for fiber, LCD, crystal, inductance, PCB, battery, computer, mobile phone and other products of high temperature resistance, low temperature resistance, moisture resistance cycle test.
Recommended model 2: vibration of the comprehensive chamber
Vibration of the comprehensive chamber combined with temperature, humidity, vibration function in one, suitable for aerospace products, information electronic instruments, materials, electrical, electronic products, all kinds of electronic components in a comprehensive harsh environment to test their performance indicators. Vibration of the comprehensive chamber mainly for aerospace, aviation, petroleum, chemical, electronics, communications and other scientific research and production units to provide temperature and humidity change environment, at the same time in the test chamber will be electric vibration stress according to the specified period of the test on the test, for the user of the whole machine (or components), electrical appliances, instruments, materials for temperature and humidity, vibration comprehensive stress screening test. In order to assess the adaptability of the test product or to evaluate the behavior of the test product. Compared with the effect of a single factor, it can more truly reflect the adaptability of electrical and electronic products to temperature, humidity and vibration complex environment changes in transportation and actual use, and expose product defects, which is an essential and important test means for the whole process of new product development, prototype test and product qualification test.
Recommended model 3: salt spray test chamber
The salt spray test chamber is suitable for all kinds of communication electronic products, electronic appliances, hardware parts to do neutral salt spray test (NSS) and corrosion test (AASS, CASS), omplied with CNS, ASTM, JIS, ISO and other standards. The salt spray test is to test the corrosion resistance of the products on the surface of various materials after anti-corrosion treatment such as coating, electroplating, anodic treatment and anti-rust oil.
Recommended model 4: waterproof and dustproof test chamber
Waterproof and dustproof test chamber is suitable for outdoor terminals such as metering automation terminals and distribution network automation terminals to carry out rain and dust tests to ensure that the tested products can withstand the impact of harsh environmental changes, so that the products can operate safely and reliably, and are suitable for external lighting and signal devices and automotive lamp shell protection. It can provide realistic simulation of various environments such as water, spray and dust tests that electronic products and their components may be subjected to during transportation and use. In order to detect the waterproof and dustproof performance of various products.
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