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Ability Claim | Introduction to Salt Spray Test
Author.
LCS
Source:
Post time:
2024-04-28
1、 Why do we need to test salt spray
Salt spray testing is an accelerated corrosion resistance evaluation method for artificial atmospheres It atomizes a certain concentration of salt water and then sprays it into a closed constant temperature box. By observing the changes of the tested sample after being placed in the box for a period of time, it reflects the corrosion resistance of the tested sample. It is an accelerated testing method that takes a short time, not a few years, only a few days, or even a few hours
2、 Which products require salt spray testing
Metals and their alloys
Metal coating
Organic cover layer
Anodic oxide film
Electrical and electronic products
3、 Cover layer
1) Coverage layer type
Organic coating, such as paint, varnish, powder coating, rust proof oil, etc
Metal coating, such as electroplating, chemical plating, ion plating, spray coating, hot dip coating, chemical vapor deposition, etc. Commonly used electroplating layers include zinc plating, copper plating, nickel plating, chromium plating, tin and brass plating, and lead tin alloy plating
2) Cover layer effect
Aesthetics, such as bright chrome plating
Protect the base metal from corrosion
4、 Classification of testing methods for salt spray testing
Neutral Salt Spray Test (NSS)
Acetate Salt Spray Test (AASS)
Copper Accelerated Acetate Salt Spray Test (CASS)
5、 Common standards:
ISO 9227:2022
ASTM B117-2019
GB/T 2423.17-2008
6、 Test conditions
Sodium chloride solution concentration 50g/L ± 5g/L
The pH value is 6.5~7.2
Temperature inside the test chamber 35 ± 2 ° C
The settling speed of salt spray is every 80cm ² 1.5 ± 0.5mL per hour
7、 Sample preparation
The type, quantity, shape, and size of the sample shall be determined according to the product standard. If there is no standard, it shall be negotiated by relevant parties
Before the experiment, the sample must be cleaned using appropriate methods, but protective organic films intentionally coated on the sample should not be removed.
For the cut sample, paint, paraffin, or tape should be used to protect the cutting area.
8、 Test time
The test time is determined according to different product specifications. Generally speaking, it is 2/4/6/8/24 hours, and if it is greater than 24 hours, it is an integer multiple of 24 hours.
9、 Post test sample processing
After the experiment, take out the sample and let it dry naturally indoors for 0.5-1 hour. Then, gently rinse with clean flowing water at a temperature not exceeding 40 degrees Celsius to remove any residual salt spray solution. Immediately blow dry with a hair dryer
10、 Equipment Capability Introduction
Working size 1:2000 * 1000 * 600mm
Working size 2: 1200 * 1000 * 500mm
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