Key equipment facts
Chamber sizes range from 120 litres to 2600 litres capacity and feature a low loading threshold and an easily opened canopy that incorporates a large viewing window. Standard or Premium configurations can be specified, as can an extensive range of optional accessories to match each installation to precise application requirements.
“User experience has been a key driver behind many features of the new units, such as a full colour touch screen, which allows pre-programmed sequences to be set,” says Ascott’s MD, Chris Gates. “A choice of supports and mounting systems for product location is also available as are refrigeration units, SO2 gas dosing systems, automatic salt dosing and software options for data logging.”
An increasingly important element in manufacturing, corrosion testing impacts directly on performance, durability and product appearance. The new chambers, says Ascott Analytical, will help users maximise this key stage in product development and production.
Standard Review – ASTM G85 annex A4
Sulphur dioxide (SO2) salt spray test, cyclic
Can be used to test the relative resistance to corrosion of product samples that are likely to encounter a combined SO2/salt spray/acid rain environment during their usual service life.
Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles. In either case, the exposure to salt spray may be salt water spray or synthetic sea water spray. The most appropriate test cycle and spray solutions are to be agreed between purchaser and seller.
The first climate cycle comprises of a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water/synthetic seawater solution, which falls-out onto the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. During this spraying, the chamber is dosed with SO2 gas at a rate of 35cm³/minute/m³ of chamber volume, for 1 hour in every 6 hours of spraying. The entire test cycle is at a constant chamber temperature of +35C. The number of cycle repeats and therefore the test duration is variable.
The second climate cycle comprises of 0.5 hours of continuous indirect spray of neutral (pH 6.5 to 7.2) salt water/synthetic seawater solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. This is followed by 0.5 hours of dosing with SO2 gas at a rate of 35cm³/minute/m³ of chamber volume. This is followed by 2.0 hours of high humidity soak. The entire test cycle is at a constant chamber temperature of +35C. The number of cycle repeats and therefore the test duration is variable
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