This test standard comprises of 5 climate modifications to the basic salt spray test. These 5 modifications are known by the following annexes and descriptions:
1. ASTM G85 annex A1 – acetic acid salt spray test, continuous
Can be used to test the relative resistance to corrosion of decorative chromium plating on steel and zinc based die castings, 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) saltwater 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 an ASS test.
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2. ASTM G85 annex A2 – cyclic acidified salt spray test
Can be used to test the relative resistance to corrosion of aluminum alloys when exposed to a changing climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 part repeating the cycle. 0.75 hours exposure to a continuous indirect spray of acidified (pH 2.8 to 3.0) saltwater solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. This is followed by 2.0 hours exposure to an air drying (purge) climate. This is followed by 3.25 hours exposure to a high humidity climate of 95%RH. The entire test cycle is at a constant chamber temperature of +49C. The number of cycle repeats and therefore the test duration is variable.
This test is also referred to as a MASTMAASIS test.
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3. ASTM G85 annex A3 – seawater acidified test, cyclic
Can be used to test the relative resistance to corrosion of coated or uncoated aluminum alloys and other metals, when exposed to a 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 the 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.
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4. 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) saltwater/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 a continuous indirect spray of neutral (pH 6.5 to 7.2) saltwater/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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5. ASTM G85 annex A5 – dilute electrolyte cyclic fog /dry test
Can be used to test the relative resistance to corrosion paints on steel, when exposed to a 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 the cycle. 1.0 hours exposure to a continuous indirect spray of dilute acidified (pH 5.0 to 5.4) saltwater 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.
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