Test Standard Type: Cyclic Corrosion Test (CCT) Standards

D17 2028

Corrosion test with automatic changeover of humidity & drying phases (Renault)

This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of pollution by chloride ions and exposure to hot/humid and hot/dry atmospheres. The entire test cycle comprises of a main cycle and a sub-cycle. 1 entire test cycle takes 24 hours to execute. The number of entire cycle repeats and therefore the test duration is variable.

The main test cycle begins with 30 minutes of salt spray (pollution) during which a continuous indirect spray of acidic (pH 4.0) salt water solution, falls-out on to the specimens at a rate of 4.0 to 6.0ml/80cm²/hour, in a chamber temperature of +35C. This is followed by 5 minutes of air flushing (purging). This is followed by 5 minutes of wall rinsing, during which the chamber walls are rinsed with deionized water. This is followed by another 5 minutes of air flushing. This is followed by 1 hour 40 minutes of drying in a climate of 20%RH at +35C. This is followed by 1 hour 35 minutes of drying in a climate of 55%RH at +35C.

This is then followed by a repetitive sub-cycle comprising of 1 hour 20 minutes exposure to a humid climate of 90%RH at +35C, followed by 2 hours 40 minutes of drying in a climate of 55%RH at +35C. This sub-cycle is repeated 5 times in total, before the main test cycle starts again.

This Renault test is also referred to as an Essai de Corrosion Cyclique, often abbreviated to ECC-1.

Renault ECC-1

Corrosion test with automatic changeover of humidity & drying phases (Renault)

This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of pollution by chloride ions and exposure to hot/humid and hot/dry atmospheres. The entire test cycle comprises of a main cycle and a sub-cycle. 1 entire test cycle takes 24 hours to execute. The number of entire cycle repeats and therefore the test duration is variable.

The main test cycle begins with 30 minutes of salt spray (pollution) during which a continuous indirect spray of acidic (pH 4.0) salt water solution, falls-out on to the specimens at a rate of 4.0 to 6.0ml/80cm²/hour, in a chamber temperature of +35C. This is followed by 5 minutes of air flushing (purging). This is followed by 5 minutes of wall rinsing, during which the chamber walls are rinsed with deionized water. This is followed by another 5 minutes of air flushing. This is followed by 1 hour 40 minutes of drying in a climate of 20%RH at +35C. This is followed by 1 hour 35 minutes of drying in a climate of 55%RH at +35C.

This is then followed by a repetitive sub-cycle comprising of 1 hour 20 minutes exposure to a humid climate of 90%RH at +35C, followed by 2 hours 40 minutes of drying in a climate of 55%RH at +35C. This sub-cycle is repeated 5 times in total, before the main test cycle starts again.

This Renault test is also referred to as an Essai de Corrosion Cyclique, which is where the abbreviation ECC-1 comes from.

This Renault automotive test standard is the same as D17 2028. Please see elsewhere in this document for details of D17 2028.

FORD CETP00.00-L-467

Ford Laboratory Accelerated Cyclic Corrosion Test

This test procedure from Ford serves as a general purpose atmospheric corrosion test and can be applied to a wide variety of materials, coatings and interactions of materials.

It has been developed to allow the evaluation of the corrosion resistance of metals in environments where there is a significant influence of chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate. The first 5 days comprise of the following 3 part repeating cycle. 6.0 hours exposure to a ‘wet’ climate of no less than 95%RH, at +25°C, with intermittent exposure to salt solution. This is followed by 2.5 hours climate controlled transition to 50°C & 70%RH. This is followed by 15.5 hours exposure to a constant climate of 50°C & 70%RH. The final 2 days comprise of 48.0 hours exposure to a constant climate of 50°C & 70%RH. This completes the total 7 day test cycle. The number of cycle repeats and therefore the test duration is variable.

This test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.

CCT-4

This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of a relatively short period of salt spray, followed by exposure to hot/humid and hot/dry atmospheres. The entire test cycle comprises of a main cycle and a sub-cycle. 1 entire test cycle takes 24 hours to execute. The number of entire cycle repeats and therefore the test duration is variable.

The main test cycle begins with 10 minutes exposure to a continuous indirect spray of salt water solution, in a chamber temperature of +35C . This is followed by 155 minutes of air drying at +60C. This is followed by 75 minutes exposure to a high humidity climate of 95%RH at +60C.

This is then followed by a repetitive sub-cycle comprising of 160 minutes of exposure to an air drying at +60C, followed by 80 minutes exposure to a humid climate of 95%RH at +60C. This sub-cycle is repeated 5 times in total, before the main test cycle starts again.

CCT-2

This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 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 +35C . This is followed by 4.0 hours of air drying in a climate of 20 to 30%RH at +60C. This is followed by 2.0 hours exposure to a condensing water climate (wetting) of 95 to 100%RH at +50C. The number of cycle repeats and therefore the test duration is variable.

The maximum transition times between each part of the test cycle are also specified as follows:

From salt spraying to air drying within 30 minutes.

From air drying to wetting within 15 minutes.

From wetting to salt spraying within 30 minutes.

CCT-1

This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.

Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 part repeating cycle. 4.0 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 +35C . This is followed by 2.0 hours of air drying in a climate of 20 to 30%RH at +60C. This is followed by 2.0 hours exposure to a condensing water climate (wetting) of 95 to 100%RH at +50C. The number of cycle repeats and therefore the test duration is variable.

The maximum transition times between each part of the test cycle are also specified as follows:

From salt spraying to air drying within 30 minutes.

From air drying to wetting within 15 minutes.

From wetting to salt spraying within 30 minutes.

ASTM G44

Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution.

This standard covers procedures for making alternate immersion stress corrosion tests in 3.5% sodium chloride, used primarily for tests of aluminium alloys and ferrous alloys but maybe used for other metals exhibiting susceptibility to chloride ions.

The test utilises a 1 hour cycle that includes a 10 minute period in an aqueous solution of 3.5% sodium chloride followed by a 50 minute period out of the solution during which the specimens are allowed to dry. This 1 hour cycle is continued 24 h/day for the total number of days recommended for the particular alloy being tested, typically from 20 to 90 days or longer depending upon the resistance of the alloy to corrosion by saltwater

AS 2331 M 3.13 Cycle E

Methods of test for metallic and related coatings : Corrosion and Related Property Tests – Wet (Salt Fog)/Dry/Humidity

This test standard comprises of 5 climate modifications to the basic salt spray test. 4 of these are as described below and are known by the following annexes and descriptions:

Appendix A Cycle A

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 3 part repeating cycle. 2 hours exposure to a continuous indirect spray of salt water solution at 35°C , which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. This is followed by 4.0 hours exposure to an air drying (purge) climate at 60°C. This is followed by 2 hours exposure to a high humidity climate of 95%RH at 50°C. This climate is maintained under constant steady state conditions. The test cycle can be repeated for 30 cycles (240h), 60 cycles (480h), 90 cycles (720h) or 180 cycles (1440h) cycles. Note: this cycle corresponds with the CCT-2 cycle.

Appendix B Cycle B

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of several steps starting with a continuous period of 24 hours indirect spray of salt water solution at 35°C followed by 8 hours of wetting at 40°C and 16 hours exposure to ambient conditions. This is followed by a repeat pattern of wetting and exposure to ambient conditions totalling 168 hours. Unless otherwise agreed, the test cycle shall be repeated for 840h.

Appendix C Cycle C

The spray solution is prepared by dissolving sodium chloride and ammonium sulphate in water to give concentrations of 0.31+/- 0.01 g/L and 4.1+/- 0.01 g/L respectively. The pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of 3.5 hours of spray solution at 30°C, followed by a 3.5 hour step of dry purge at 40°C. A period of 24.5 hours at 75% RH is then followed by a 102 minute step of dry purge at 30°C. Having multiple steps this is then followed by a 3.5 hour exposure of spray solution at 30°C followed by another high humidity soak at the same temperature for just over 6 hours. This is then completed off by two dry air purges of 3 hours at 35°C and 2 hours at 25°C respectively. Unless otherwise agreed, the test cycle shall be repeated for 1000h.

Appendix E Cycle E

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 4 part repeating cycle. 4 hours exposure to a continuous indirect spray of salt water solution, at 35°C, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. 2 hours dry purge at 60°C, 0.5 hours dry purge at 40°C followed by a 2 hour high humidity soak at 50°C. Unless otherwise agreed, the cycle shall be repeated for 4000h.

For further information on AS standards visit; www.standards.com.au

AS 2331 M 3.13 Cycle C

Methods of test for metallic and related coatings : Corrosion and Related Property Tests – Wet (Salt Fog)/Dry/Humidity

This test standard comprises of 5 climate modifications to the basic salt spray test. 4 of these are as described below and are known by the following annexes and descriptions:

Appendix A Cycle A

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 3 part repeating cycle. 2 hours exposure to a continuous indirect spray of salt water solution at 35°C , which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. This is followed by 4.0 hours exposure to an air drying (purge) climate at 60°C. This is followed by 2 hours exposure to a high humidity climate of 95%RH at 50°C. This climate is maintained under constant steady state conditions. The test cycle can be repeated for 30 cycles (240h), 60 cycles (480h), 90 cycles (720h) or 180 cycles (1440h) cycles. Note: this cycle corresponds with the CCT-2 cycle.

Appendix B Cycle B

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of several steps starting with a continuous period of 24 hours indirect spray of salt water solution at 35°C followed by 8 hours of wetting at 40°C and 16 hours exposure to ambient conditions. This is followed by a repeat pattern of wetting and exposure to ambient conditions totalling 168 hours. Unless otherwise agreed, the test cycle shall be repeated for 840h.

Appendix C Cycle C

The spray solution is prepared by dissolving sodium chloride and ammonium sulphate in water to give concentrations of 0.31+/- 0.01 g/L and 4.1+/- 0.01 g/L respectively. The pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of 3.5 hours of spray solution at 30°C, followed by a 3.5 hour step of dry purge at 40°C. A period of 24.5 hours at 75% RH is then followed by a 102 minute step of dry purge at 30°C. Having multiple steps this is then followed by a 3.5 hour exposure of spray solution at 30°C followed by another high humidity soak at the same temperature for just over 6 hours. This is then completed off by two dry air purges of 3 hours at 35°C and 2 hours at 25°C respectively. Unless otherwise agreed, the test cycle shall be repeated for 1000h.

Appendix E Cycle E

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 4 part repeating cycle. 4 hours exposure to a continuous indirect spray of salt water solution, at 35°C, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. 2 hours dry purge at 60°C, 0.5 hours dry purge at 40°C followed by a 2 hour high humidity soak at 50°C. Unless otherwise agreed, the cycle shall be repeated for 4000h.

For further information on AS standards visit; www.standards.com.au

AS 2331 M 3.13 Cycle B

Methods of test for metallic and related coatings : Corrosion and Related Property Tests – Wet (Salt Fog)/Dry/Humidity

This test standard comprises of 5 climate modifications to the basic salt spray test. 4 of these are as described below and are known by the following annexes and descriptions:

Appendix A Cycle A

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 3 part repeating cycle. 2 hours exposure to a continuous indirect spray of salt water solution at 35°C , which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. This is followed by 4.0 hours exposure to an air drying (purge) climate at 60°C. This is followed by 2 hours exposure to a high humidity climate of 95%RH at 50°C. This climate is maintained under constant steady state conditions. The test cycle can be repeated for 30 cycles (240h), 60 cycles (480h), 90 cycles (720h) or 180 cycles (1440h) cycles. Note: this cycle corresponds with the CCT-2 cycle.

Appendix B Cycle B

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of several steps starting with a continuous period of 24 hours indirect spray of salt water solution at 35°C followed by 8 hours of wetting at 40°C and 16 hours exposure to ambient conditions. This is followed by a repeat pattern of wetting and exposure to ambient conditions totalling 168 hours. Unless otherwise agreed, the test cycle shall be repeated for 840h.

Appendix C Cycle C

The spray solution is prepared by dissolving sodium chloride and ammonium sulphate in water to give concentrations of 0.31+/- 0.01 g/L and 4.1+/- 0.01 g/L respectively. The pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of 3.5 hours of spray solution at 30°C, followed by a 3.5 hour step of dry purge at 40°C. A period of 24.5 hours at 75% RH is then followed by a 102 minute step of dry purge at 30°C. Having multiple steps this is then followed by a 3.5 hour exposure of spray solution at 30°C followed by another high humidity soak at the same temperature for just over 6 hours. This is then completed off by two dry air purges of 3 hours at 35°C and 2 hours at 25°C respectively. Unless otherwise agreed, the test cycle shall be repeated for 1000h.

Appendix E Cycle E

The salt solution is prepared to a concentration of 50+/-10g/L and the pH of the solution shall be in the range of 6.0 to 7.0.

Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises of the following 4 part repeating cycle. 4 hours exposure to a continuous indirect spray of salt water solution, at 35°C, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour. 2 hours dry purge at 60°C, 0.5 hours dry purge at 40°C followed by a 2 hour high humidity soak at 50°C. Unless otherwise agreed, the cycle shall be repeated for 4000h.

For further information on AS standards visit; www.standards.com.au