Corrosion testing of metallic coatings – acetic acid salt spray test
Can be used to test the relative resistance to corrosion of metallic coatings, when exposed to an acetic acid salt spray climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of acidified (pH 3.1to 3.3) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.
Chamber volumes of less than 200 Litres are not permitted by this test standard.
This test is also referred to as an ASS test.
For further information on British standards visit; www.bsigroup.com
Note; BS 5466 Part 2 has been replaced by BS 7479.
Corrosion testing of metallic coatings – neutral salt spray test
Can be used to test the relative resistance to corrosion of metallic coatings, when exposed to a salt spray climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.
Chamber volumes of less than 200 Litres are not permitted by this test standard.
This test is also referred to as an NSS test.
For further information on British standards visit; www.bsigroup.com
Note; BS 5466 Part 1 has been replaced by BS 7479.
Paints & Varnishes – Determination of Resistance to neutral salt spray (fog)
Can be used to test the relative resistance to corrosion of paints and varnishes, when exposed to a salt spray (fog) climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.5ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.
Chamber volumes of less than 400 Litres are not permitted by this test standard.
This test is also referred to as a Neutral Salt Spray or NSS test.
For further information on British standards visit; www.bsigroup.com
Resistance to continuous salt spray
Can be used to test the relative resistance to corrosion of painted samples, when exposed to a salt spray climate at an ambient temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of synthetic sea water solution, which falls-out on to the specimens at a rate that consumes between 1.0 and 1.5 litres of salt solution per hour, in a chamber temperature of +20C. This climate is maintained under constant steady state conditions. The test duration is variable.
This test is also referred to as a ‘cold’ salt spray test.
For further information on British standards visit; www.bsigroup.com
Basic environmental testing procedures, salt mist, cyclic
Can be used to test the relative resistance to corrosion of components or equipment, when exposed to a changing climate of a salt mist (spray), followed by a high humidity, at an elevated temperature.
Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled humidity chamber are generally used), and exposed to a changing climate that comprises of the following 2 part repeating cycle. 2.0 hours exposure to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +15 to+35C. This is followed by either 7 days or 20 to 22 hours (depending on the test severity) exposure to a high humidity climate of 93%RH, in a chamber temperature of +40C. The number of cycle repeats is variable depending on the test severity.
For further information on British standards visit; www.bsigroup.com
Note; BS2011 Part2.1 Kb has been replaced by BS EN 60068-2-52.
Cyclic Salt Fog/UV Exposure of Painted Metal
The ASTM D5894 test requires two different types of test apparatus; a fluorescent UV-condensation exposure chamber complying with the requirements of ASTM G53, and a salt fog/dry chamber complying with the requirements of ASTM G85 annex A5. Please see here for details of ASTM G85 annex A5.
Basic environmental testing procedures, salt mist
Can be used to test the relative resistance to corrosion of protective coatings, when exposed to a salt mist (spray) climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.
This test is also referred to as a Neutral Salt Spray or NSS test.
For further information on British standards visit; www.bsigroup.com
Note; BS2011 Part2.1 Kb has been replaced by BS EN 60068-2-11.
Dilute electrolyte cyclic fog /dry test
Can be used to test the relative resistance to corrosion paints on steel, when exposed to an changing climate of dilute salt spray at ambient temperature, followed by air drying at an elevated temperature.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 2 part repeating cycle. 1.0 hours exposure to a continuous indirect spray of dilute acidified (pH 5.0 to 5.4) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in an ambient chamber temperature (21 to 27C). This is followed by 1.0 hours exposure to an air drying (purge) climate, in a chamber temperature of +35C. The number of cycle repeats and therefore the test duration is variable.
This test is also referred to as a PROHESION test.
For further information on ASTM standards visit; www.astm.com
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 on to 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.
For further information on ASTM standards visit; www.astm.com
Seawater acidified test, cyclic
Can be used to test the relative resistance to corrosion of coated or uncoated aluminium alloys and other metals, when exposed to an changing climate of acidified synthetic seawater spray, followed by a high humidity, both at an elevated temperature.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 2 part repeating cycle. 30 minutes exposure to a continuous indirect spray of acidified (pH 2.8 to 3.0) 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 90 minutes exposure to a high humidity climate of above 98%RH. The entire test cycle is at a constant chamber temperature of +49C (may be reduced to +24 to +35C for organically coated specimens). The number of cycle repeats and therefore the test duration is variable.
This test is also referred to as a SWAAT test.
For further information on ASTM standards visit; www.astm.com
