Salt spray test

Salt spray test
Introduction and classification of salt spray test
The salt spray test is mainly used to test the salt spray resistance of the surface protective layer of products or materials. It is an accelerated test to simulate the rust, corrosion and corrosion resistance of products in the ocean or salt tide environment. According to its corrosive medium, it can be divided into neutral salt spray test (NSS), acid salt spray test (ASS), copper salt accelerated salt spray test (CASS).
(1) Neutral salt spray test (NSS test) is one of the earliest applications in the field of accelerated corrosion test. It uses a 5% aqueous solution of sodium chloride solution, and the pH of the solution is adjusted to a neutral range (6-7) as a solution for spraying. The test temperature is taken at 35 ° C, and the sedimentation rate of the salt spray is required to be between 1 - 2 ml / 80 cm 2 · h.
(2) The acid salt spray test (ASS test) was developed on the basis of a neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, the pH value of the solution is reduced to about 3, the solution becomes acidic, and the salt spray finally formed is also changed from neutral salt spray to acid. Its corrosion rate is about 3 times faster than the NSS test.
(3) Copper salt accelerated salt spray test (CASS test) is a rapid salt spray corrosion test developed recently in foreign countries. The test temperature is 50 ° C, and a small amount of copper salt - copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of the NSS test.
Test parameters
Salt solution concentration, pH value, humidity, temperature, pressure value, test time, salt spray settlement, etc.
Performance impact
Coating oxidation, metal corrosion, insulation damage, air bubbles, peeling, electrical properties change, mechanical properties degradation, etc.
Salt spray test method
Generally, the corrosion resistance of the product with the lighter degree of corrosion is determined by visual inspection or low-power optical microscopy before and after the test. During the test, the temperature, salt spray concentration, humidity/salt mist cycle, and length of test time are used as the severity level.
GB/T 2423.17-2008 / IEC 60068-2-11:1981 Basic environmental test procedures Part 2-11: Test Test Ka: salt spray
GB/T 2423.18-2012/IEC 60068-2-52:1996 Environmental test Part 2: Test method Test Kb: salt spray, alternating (sodium chloride solution)
GB/T 10125-2012/BS_EN_ISO_9227_2012 Artificial atmospheric corrosion test. Salt spray test
ASTM G85-2011 Modified Salt Spray (Fog) Test Procedure
GB/T 24195-2009 Corrosion of metals and alloys Accelerated corrosion test under acidic salt spray, "dry" and "wet" conditions
GB/T 1771-2007 Varnish paints, salt sprays, varnishes and varnishes - Determination of resistance to neutral salt spray
QB/T 3826-1999 Corrosion resistance test method for metal plating and chemical treatment of light industrial products Neutral salt spray test (NSS) method
Road vehicles - Environmental conditions and testing of electrical and electronic equipment - Part 4: climatic load 5.5 Salt spray test
GB/T 28046.4-2011 Road vehicles - Environmental conditions and testing of electrical and electronic equipment - Part 4: s.
GJB150.11-1986 Environmental test methods for military equipment Salt spray test
GJB4.11-1983 Marine electronic equipment environmental test Salt spray test
GJB150.11A-2009 Environmental testing methods for military equipment - Part 11: Salt spray test
MIL-STD-810G-2008 Environmental Engineering Considerations and Laboratory Testing Part 2 509.5 Salt Spray
GMW3172-2012 General Specification for Electrical and Electronic Components - Environment / Durability 9.4.7 Salt Spray 9.4.8 Spray Salt Spray
VW80000 Automotive electrical and electronic components test items, test conditions and test requirements of 3.5 tons or less 9.6 Salt spray test (in case of extra-vehicular operation) 9.7 Salt spray test (in cabin operation)
GJB548B-2005 Microelectronic device test method and procedure Method 1009.2 Salt spray (salt steam)
GJB128A-1997 Semiconductor discrete device test method method 1041 salt gas (erosion) method 1046 salt spray (corrosion) GJB360A-1996 Electronic and electrical components test method Method 101 salt spray test
GJB360B-2009 Test Methods for Electronic and Electrical Components Method 101 Salt Spray Test
Service flow