Free Standard Download Iso 9227 Pdf
Latrisha Adan
ISO 9227 is a corrosion test in artificial atmospheres. It is a form of a salt spray test. ISO 9227 is particularly useful for detecting discontinuities, pores and damages in organic and inorganic coatings as well as for assessing the corrosion resistance of metallic materials. It is also a mean to determine if the comparative quality of a metallic material, either with or without corrosion protection, is preserved.
However, it is important to be aware of the fact that there is no direct correlation between resistance to the action of salt spray and resistance to corrosion as the corrosion stress in end-use conditions are significantly different than the ones during testing. In this way, results should not be used as a comparative guide to the long-term behavior of different coating systems or to rank different materials relative to each other. Micom offers ISO 9227 testing as part of its corrosion test services.
There are three distinct test methods in ISO 9227: the neutral salt spray (NSS), the acetic acid salt spray (AASS), and copper-accelerated acetic acid salt spray (CASS). Typically, the NSS test applies to metals and their alloys, metallic coatings (anodic and cathodic), conversion coatings, anodic oxide coatings and organic coatings on metallic materials. As for the AASS and CASS tests, they are especially useful for testing decorative coatings made of copper, nickel and chromium or only nickel and chromium. AASS and CASS have also been found suited for testing anodic coatings on aluminum.
While the position of specimens changes depending on the test, studies performed in our corrosion lab on standardized reference specimens showed that sample orientation has no significant impact on the corrosion rate.
If you have any questions about the ISO 9227 test, we invite you to contact our material testing lab today. It will be our pleasure to answer your questions and help you with your custom testing requirements.
ISO 9227:2017 specifies the apparatus, the reagents and the procedure to be used in conducting the neutral salt spray (NSS), acetic acid salt spray (AASS) and copper-accelerated acetic acid salt spray (CASS) tests for assessment of the corrosion resistance of metallic materials, with or without permanent or temporary corrosion protection.
It does not specify the dimensions or types of test specimens, the exposure period to be used for a particular product, or the interpretation of results. Such details are provided in the appropriate product specifications.
The acetic acid salt spray (AASS) test is especially useful for testing decorative coatings of copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic and organic coatings on aluminium.
The copper-accelerated acetic acid salt spray (CASS) test is useful for testing decorative coatings of copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic and organic coatings on aluminium.
The salt spray methods are all suitable for checking that the quality of a metallic material, with or without corrosion protection, is maintained. They are not intended to be used for comparative testing as a means of ranking different materials relative to each other with respect to corrosion resistance or as means of predicting long-term corrosion resistance of the tested material.
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The ISO 9227 test standard evaluates the integrity of material when subjected to salt spray. As an ISO-17025 accredited test lab, we realize the importance of salt spray and corrosion testing. Meeting the ISO 9227 requirements can be difficult. We understand the challenges and guide companies through the process.
Keystone Compliance provides the peace of mind that all of your needs will be met. Our engineers take a consultative approach throughout the entire test program. Next, we expedite comprehensive reports shortly after the completion of the test. Lastly, when products do not meet the requirements, we assist with the troubleshooting process.
The ISO 9227 regulatory compliance test evaluates the resistance of corrosion of metallic materials when subjected to neutral and acidic salt spray. This standard specifically assesses neutral salt spray, acetic acid salt spray, and copper-accelerated acetic acid salt spray.
The salt spray methods are all suitable for checking that the comparative quality of a metallic material, with or without corrosion protection is maintained. On the other hand, ISO 9227 is not used for comparative testing. The standard does not rank different materials relative to each other concerning corrosion resistance.
These conditions consist of a temperature of 35C to 50C. The average concentration rate for a horizontal collecting area of 80cm2 is 1.5ml/h. The concentration of sodium chloride will be roughly 50g/l. Lastly, the pH will range from 3.1 to 7.2 for the respective spray test.
Three different methods are used to evaluate the corrosion of a cabinet. These include the Neutral Salt Spray test (NSS), Acetic Acid Spray test (AAS), and the Copper Accelerated Acetic Acid Salt Spray test (CASS). Each test has different guidelines for atmospheric pressure, temperature, and sodium chloride concentration.
At the end of the test period, the specimen is removed from the cabinet. Next, it is dried for 30 minutes to an hour. This is done before rinsing the product to reduce the risk of removing corrosion. The spray residue is removed from the specimen.
Lastly, different criteria for the evaluation of the test results are compiled into a report. The test report will indicate the outcome of the test according to the respective standard criteria. The information encompassed within the report also contains the following. This list is not intended to be all-inclusive.
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ISO 9227-ASS: The acetic acid salt spray test.
Is widely used for testing decorative coatings from copper-nickel-chrome or nickel-chrome. It is also widely used for organic coatings on aluminum (as also prescribed in Qualicoat). The difference with ISO 9227-NSS is that in the ASS test the salt solution is acidified to pH 3.1-3.3 by the addition of glacial acetic acid.
ISO 9227-CASS: The copper-acetic acid salt spray test.
The CASS variant, like the ASS variant, is widely used for testing decorative coatings from copper-nickel-chrome or nickel-chrome and sometimes on coated or anodized aluminum. The design is similar to that of the ASS, however with an additional addition of 0.26 grams /liter of CuCl2*2H2O and a temperature of 50C.
Salt spray chamber simulates the harsh environmental condition or standardized artificial corrosion conditions which accelerates corrosion on the metallic materials. To create such harsh condition inside this salt spray tester the chamber manufactured should withstand these globally accepted standards to achieve high quality specimen. The results obtained by using salt spray chamber test will let you know the suitability and usability of that particular material in various industrial sectors like aerospace, automobile, energy, marine, defense and many more.
Guidance is provided that how the experiment will be conducted throughout the time period stepwise from the setting of temperature, creating air pressure through gauge upto regulating the saline water and maintaining consistent required fog condition inside the fibre reinforced body. The standardised reporting should be maintained like test conditions such as required temperature should be upto 45 degree celcius and maintaining 1 to 2 ml/hr water must be collected in fog collector and if it is not happening it means need to adjust the water flow or air flow to maintain it. Reproducibility and repetitiveness is consistently maintained. Standardised test service conditions for assessing real condition natural environment for corrosion is nurtured.
ASTM B117 provides a comprehensive framework for conducting salt spray testing and evaluating the corrosion resistance of materials in a standardized and internationally accepted manner.
JIS Z 2371
JIS Z 2371 stands for Japanese Industrial Standards. JIS Z 2371 serves as a crucial reference in Japan for evaluating the corrosion resistance of metals. It provides a comprehensive framework for conducting salt spray tests, simulating corrosive conditions. This standard guides users through the entire testing process, from setting up the test to preparing materials and interpreting results. Essentially, it's the standardized preferred manual in Japan to determine how well metals and coatings can withstand environmental challenges. Industries in Japan rely on JIS Z 2371 to meet local standards and regulations, ensuring the durability and reliability of materials in the face of corrosion.
All these standards ASTM B117,ISO 9227 and JIS Z 2371 share similarities in testing objectives, apparatus, and procedures, the distinctions stem from regional preferences, specific industrial requirements, and the governing bodies behind each standard. Manufacturer should select the appropriate standard based on their geographical location, industry specifications, and adherence to regulatory standards. This ensures that the chosen testing standard is in line with the specific context and conditions relevant to the user's location and industry, facilitating accurate and meaningful assessments of corrosion resistance for metallic materials for salt spray tests.
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