Electronic Product Salt Spray Test

Salt spray test is a widely adopted artificial accelerated corrosion testing method. It is used to evaluate the corrosion resistance of metallic materials and their protective layers (including electroplating, coatings, and chemical conversion films). As a critical inspection procedure for product corrosion resistance, it is indispensable across industries such as automotive, marine, aerospace, electrical & electronic products, and hardware building materials. This test enables engineers to screen materials efficiently, optimize production processes, control product quality, and ensure products can withstand erosion from harsh operating environments.

Relying on advanced testing equipment and a team of senior experts, JJR LAB delivers accurate, efficient and professional testing services as well as comprehensive analysis solutions for global clients.

What is Salt Spray Test

The salt spray test simulates and creates a salty humid atmospheric environment in a laboratory. Product samples are exposed to this environment for a set duration, and subsequent corrosion phenomena are observed to assess their resistance to corrosion in real marine or salt-containing humid conditions.

Basic Principle: Sodium chloride dissolves in water to form an electrolyte solution, which forms micro-batteries on metal surfaces and accelerates the electrochemical corrosion process. Increasing ambient temperature and salt solution concentration can drastically speed up corrosion, generating visible corrosion results in a short period.

Purposes of Salt Spray Test

1. Quality Evaluation & Consistency Verification
The core purpose is to quickly verify whether the corrosion resistance of plating and coatings from different production batches or manufacturing processes meets official standards and design expectations.

2. Material Selection Reference
Compare the anti-corrosion performance of various materials and surface protection processes (galvanizing, chromium plating, spray painting, dacromet coating, etc.), providing reliable data support for product material selection and process formulation.

3. Defect Detection & Process Optimization
By analyzing corrosion products and damage types (pitting, cracking, blistering, etc.), identify defects in structural design, material matching and surface treatment processes to support targeted technical improvements.

4. Accelerated Environmental Simulation
Based on environmental correlation data, simulate and accelerate the corrosion process of products in marine and industrial atmospheric environments, so as to predict long-term corrosion resistance performance.

Applicable Products

• Electronic components, PCB boards and integrated circuits

• Consumer electronic devices

• Automotive electronic parts and controllers

• LED lighting products and photovoltaic modules

• Aerospace equipment and military products

• Medical devices

• Household electrical appliances

• Hardware, construction and industrial supplies

Applicable Testing Standards

Main Salt Spray Test Items

1. Neutral Salt Spray Test (NSS)

• Overview: The most fundamental, classic and universally applied salt spray test type.

• Test Solution: 5% ± 1% sodium chloride solution with neutral pH (6.5 ~ 7.2).

• Test Temperature: 35°C ± 2°C.

• Application: Basic corrosion resistance testing for metals, alloys, metal plating, organic coatings and anodic oxide films.

2. Acetic Acid Salt Spray Test (AASS)

• Overview: Based on neutral salt spray conditions, glacial acetic acid is added to lower the solution pH to an acidic range.

• Test Solution: 5% sodium chloride solution, pH adjusted to 3.1 ~ 3.3 with glacial acetic acid.

• Test Temperature: 35°C ± 2°C.

• Application: Mainly for decorative plating (Cu-Ni-Cr, Ni-Cr coating) and aluminum alloy anodic oxide films. It features faster corrosion speed and stronger corrosiveness compared with NSS.

3. Copper-Accelerated Acetic Acid Salt Spray Test (CASS)

• Overview: Copper chloride is added to the acetic acid salt spray solution to further accelerate the corrosion reaction.

• Test Solution: 5% sodium chloride solution with 0.26 g/L copper chloride, pH adjusted to 3.1 ~ 3.3 via glacial acetic acid.

• Test Temperature: 50°C ± 2°C.

• Application: The fastest corrosion-rate salt spray test, widely used for rapid quality assessment of high-end decorative plating (automobile wheel hubs, premium hardware Ni-Cr and Cu-Ni-Cr coatings). Several hours of CASS testing is equivalent to dozens of hours of NSS testing.

4. Cyclic Corrosion Test (CCT)

• Overview: An advanced testing method combining multiple cyclic stages including spraying, drying, wetting and standing, instead of continuous salt spraying.

• Working Principle: Simulates alternating day-night and dry-wet cycles in real environments. Corrosive salt concentrates during the drying phase, causing more severe damage than constant humid conditions.

• Application: Features higher correlation with natural environments than traditional constant salt spray tests, accurately reflecting actual product corrosion resistance. Widely used in automotive and aerospace industries.

Testing Cycle

• Standard Lead Time: Testing duration + 3 working days, subject to specific test conditions and sample quantity.

• Expedited Service: Paid rush testing is available to shorten the cycle according to client requirements.