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Volvo STD 423-0014 is a test method constructed to evaluate the corrosion resistance of metals, especially in environments with a high concentration of chloride ions, primarily from a marine influence or from winter de-icing chemicals.
The test is incredibly effective in simulating the effects of corrosion in an accelerated and controlled way.
This accelerated test applies to: metals and their alloys, metallic coatings, chemical conversion coatings and organic coatings, and is undertaken on test panels or on suitable test objects and components.
The test method is composed of approximately 1% NaCL salt mist applications combined with a drying and controlled temperature and humidity phases, the length of the test process is variable.
The recommended specification for the equipment required to undertake this test includes the use of oscillating spray nozzles located high up in the test chamber. These spray salt water solution down on to test samples located beneath, in a precise spray pattern, to ensure a uniform distribution.
The 7 day main test cycle is composed of two twelve hour sub-cycles, one with cycling controlled humidity, the other with salt spray application.
On Mondays & Fridays, sub-cycle 1 is replaced once by sub-cycle 2
The test duration will need to be determined by the testing department, however in general a six week test should be enough to rank any bare metal or one protected with a thin conversion coating.
This corrosion test is utilised widely by Scania and by their suppliers as a quality audit of components.