Test Standard Type: Salt Spray/Mist/Fog Test Standards

MIL-STD-750 method 1046

Method 1046.3: Salt Spray (Corrosion)

This MIL standard had been revised and re-issued several times, with each issue being designated a new sequential suffix letter, which appears after the main standard number. With each revision the method number specific to this particular test may have changed, but the method itself is generally as follows:

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, which falls-out on to the specimens at a rate that deposits 0.5 to 3.0/80cm²/hour based on an average run of at least 16 hours, in a chamber temperature of +35°C +1.1°C, –1.7°C. This climate is maintained under constant steady state conditions. The test duration is either 48 hours or 96 hours.

Note that a 24hr drying period at 40°C is required at the completion of the test.

For further information on US Dept of Defence MIL standards visit; www.nssn.org

MIL-STD-202

Electronic & electrical component parts: Salt Spray (Corrosion)

This MIL standard had been revised and re-issued several times, with each issue being designated a new sequential suffix letter, which appears after the main standard number. With each revision the method number specific to this particular test may have changed, but the method itself is generally as follows:

Can be used to test the relative resistance to corrosion of coated and uncoated specimens, 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 0.5 to 3.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.

For further information on US Dept of Defence MIL standards visit; www.nssn.org

JNS 30.16.03

Test method for resistance to salt fog (Jaguar)

JNS 30.16.03

This Jaguar automotive test standard is based upon test standard ASTM B117. Please see elsewhere in this document for details of ASTM B117.

JIS Z 2371

Methods of neutral salt spray testing

Can be used to test the relative resistance to corrosion of coated and uncoated metallic specimens, 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 Japanese JIS standards visit; www.jsa.or.jp/default_english.asp

JIS H 8502 M3

Methods of corrosion resistance test for metallic coatings

Can be used to test the relative resistance to corrosion of electro-plated coatings, when exposed to different corrosive atmospheres, as follows:

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 an NSS test

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, acidified (pH 3.1to 3.3) by the addition of acetic acid, 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

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, with copper chloride added and acidified (pH 3.0 to 3.2) by the addition of acetic acid, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +50C. This climate is maintained under constant steady state conditions. The test duration is variable.

This test is also referred to as a CASS test

Test specimens are coated with Corrodkote mud, which is applied to the surface of the samples and allowed to dry. Then the samples are placed in a controlled climate of +38C and 80 to 90%RH (non condensing) and allowed to stand for 16 hours (1 cycle). For further cycles the samples are cleaned and fresh Corrodkote is applied.

Test specimens are exposed to a controlled climate of +40C and 90%RH and SO2 gas in a concentration of either 25ppm or 1000ppm.

Chamber volumes of less than 200 Litres are not permitted by JIS H 8502.

For further information on Japanese JIS standards visit; www.jsa.or.jp/default_english.asp

JIS H 8502 M2

Methods of corrosion resistance test for metallic coatings

Can be used to test the relative resistance to corrosion of electro-plated coatings, when exposed to different corrosive atmospheres, as follows:

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 an NSS test

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, acidified (pH 3.1to 3.3) by the addition of acetic acid, 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

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, with copper chloride added and acidified (pH 3.0 to 3.2) by the addition of acetic acid, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +50C. This climate is maintained under constant steady state conditions. The test duration is variable.

This test is also referred to as a CASS test

Test specimens are coated with Corrodkote mud, which is applied to the surface of the samples and allowed to dry. Then the samples are placed in a controlled climate of +38C and 80 to 90%RH (non condensing) and allowed to stand for 16 hours (1 cycle). For further cycles the samples are cleaned and fresh Corrodkote is applied.

Test specimens are exposed to a controlled climate of +40C and 90%RH and SO2 gas in a concentration of either 25ppm or 1000ppm.

Chamber volumes of less than 200 Litres are not permitted by JIS H 8502.

For further information on Japanese JIS standards visit; www.jsa.or.jp/default_english.asp

JIS H 8502 M1

Methods of corrosion resistance test for metallic coatings

Can be used to test the relative resistance to corrosion of electro-plated coatings, when exposed to different corrosive atmospheres, as follows:

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 an NSS test

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, acidified (pH 3.1to 3.3) by the addition of acetic acid, 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

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, with copper chloride added and acidified (pH 3.0 to 3.2) by the addition of acetic acid, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +50C. This climate is maintained under constant steady state conditions. The test duration is variable.

This test is also referred to as a CASS test

Test specimens are coated with Corrodkote mud, which is applied to the surface of the samples and allowed to dry. Then the samples are placed in a controlled climate of +38C and 80 to 90%RH (non condensing) and allowed to stand for 16 hours (1 cycle). For further cycles the samples are cleaned and fresh Corrodkote is applied.

Test specimens are exposed to a controlled climate of +40C and 90%RH and SO2 gas in a concentration of either 25ppm or 1000ppm.

Chamber volumes of less than 200 Litres are not permitted by JIS H 8502.

For further information on Japanese JIS standards visit; www.jsa.or.jp/default_english.asp

ISO 9227

Salt spray corrosion tests in artificial atmospheres

Can be used to test the relative resistance to corrosion of metallic materials with or without temporary or permanent corrosion protection, when exposed to a salt spray climate (neutral salt spray or acetic acid salt spray or copper accelerated acetic acid salt spray) 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) or acidified (pH3.1 to 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 or +50C. This climate is maintained under constant steady state conditions. The test duration is variable.

These tests are also referred to as a NSS, ASS & CASS tests.

For further information on ISO standards visit; www.iso.org

Note; many ISO test standards have been harmonized with other European standards and these are now prefixed ‘EN’ (Euro Norm) or ‘** EN’ – where ** are the letters representing a European country/language code, for example ‘BS EN’ for a harmonized British standard in English language.

ISO 7253

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 ISO standards visit; www.iso.org

Note; many ISO test standards have been harmonized with other European standards and these are now prefixed ‘EN’ (Euro Norm) or ‘** EN’ – where ** are the letters representing a European country/language code, for example ‘BS EN’ for a harmonized British standard in English language.

ISO 3770

Corrosion testing of metallic coatings – copper accelerated acetic acid salt spray test

Can be used to test the relative resistance to corrosion of metallic coatings, when exposed to a copper accelerated 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 +50C. 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 a CASS test.

For further information on ISO standards visit; www.iso.org

Note; ISO 3770 has been replaced by ISO 9227.