The test standard summaries are for general guidance only. Though believed to be accurate at the time of writing, this may change over time. So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level.
Note: the terms salt spray, salt mist and salt fog are all in wide spread use within corrosion test standards. In this context they can be considered to be equivalent and interchangeable terms.
JASO M609 – 2024 – Method B Salt Spray
Automotive Parts and Materials Corrosion Test Methods
This standard revises JASO M 609 (Corrosion Test Methods for Automotive Materials) and JASO M 610 (Test Methods for Automotive Parts Appearance Corrosion) by reclassifying the test types for appearance corrosion and pitting corrosion in order to improve correlation with the actual corrosion conditions of automobiles in the market.
The standard specifies a method for determining the corrosion resistance (exterior corrosion and pitting corrosion) of steel materials used for automobiles and automotive parts and materials made of steel materials with surface treatment on the base material by a combined cycle test.
The test has been split into two new methods, covering two applications
- Apperance Corrosion – Cycle Method A or B
- Perforated Corrosion – Cycle Method C
The test method consists of repeatedly exposing the specimens to salt water, dry and wet atmospheres under specified conditions, and evaluating the appearance corrosion of parts and materials, pitting corrosion in mating parts, etc. The test is performed by repeatedly exposing the specimens to salt water, dry and wet atmospheres in sequence.
Test Method B has been split into two test applications
- Salt Spray Method (salt atomisation)
- Salt Shower Method (overhead oscillating salt spray)
Here we discuss the 1st application for Salt Spray Method
Method B Salt Spray Method Test Conditions
| Method B | Function | Duration | Transistion included in duration |
| 1 | Salt Spray 50℃ +/-1℃ | 1 hour | 1 hour |
| 2 | Drying 60℃ +/-1℃ & 50 %RH±5 ％RH | 8 hours | 30 min |
| 3 | Wetting 50℃ +/-1℃ & 95 %RH or above | 4 hours | 1 hour |
| 4 | Drying 60℃ +/-1℃ & 50 %RH±5 ％RH | 7 hours | 30 min |
| 5 | Wetting 50℃ +/-1℃ & 95 %RH or above | 4 hours | 30 min back to step 1 |
| Fallout requirement is 1-2ml per 80cm² per hour |
Chamber volumes of less than 400 Litres are not permitted by this test standard.
This test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.
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