There are three distinct test method in ISO the neutral salt spray (NSS), the acetic acid salt spray (AASS), and copper-accelerated acetic. ISO NSS. adv. auto technology banner. A discussion started in but continuing through Q. We have a customer, that we supply some zinc. The salt spray (or salt fog) test is a standardized and popular corrosion test method, used to Other important relevant standards are ISO, JIS Z and ASTM G The most common test for steel based materials is the Neutral Salt Spray test (often abbreviated to NSS) which reflects the fact that this type of test.
|Published (Last):||25 July 2005|
|PDF File Size:||10.34 Mb|
|ePub File Size:||3.52 Mb|
|Price:||Free* [*Free Regsitration Required]|
Corrosion tests in artificial atmospheres – Salt spray tests
A discussion started in but continuing through Q. The test duration is variable. ASTM B was the first internationally recognized salt spray standard, originally published in These standards describe the necessary information to carry out this test; testing parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pHetc.
This is followed isso 0. Is there any equivalence between this two standards? Usually, the materials to be tested are metallic although stone, ceramics, and polymers may also be tested and finished with a surface coating which is intended to provide a degree of corrosion protection to the underlying metal.
So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level. This test 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.
In either case, the exposure to salt spray may be salt water spray or synthetic sea water prepared in accordance with the requirements nsz the test standard. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
ISO – Corrosion tests in artificial atmospheres — Salt spray tests
Corrosion iwo and standards: 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. Any ISO standard is available for this Testing?
Most Salt Spray Chambers today are being used NOT to predict the corrosion resistance of a coating, but to maintain coating processes such as pre-treatment and painting, iwo, galvanizing, and the like, on a comparative basis. A requirement that a component ‘pass’ an accelerated corrosion test isn’t often meaningful until the finishing spec tells you what that means: But we haven’t supported older browsers like IE8.
Regards, Ted Mooney, P. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time. This is followed by 3. Please note The test standard summaries are for general guidance only.
This is followed by 1. Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, prepared in accordance with the requirements of the test standard and acidified to pH 3.
This climate is maintained under constant isso state conditions. Testing periods range from a few hours e. You will then need to talk to your customer about the possibility of using one specification in lieu of the other.
Although popular in certain industries, modified salt spray testing has in many cases been superseded by Cyclic corrosion testing CCT The type of environmental test chambers used for modified salt spray testing to ASTM G85 are generally similar to the chambers used for testing to ASTM Bbut will often have some additional features, such as an automatic climate cycling control system.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle.
In this context they can be considered to be equivalent and interchangeable terms. From beautiful Pine Beach New Jersey: This test can be used to test the relative resistance to corrosion of aluminium ixo when exposed to a 927 climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
This is considered an out of date browser. The salt spray methods are all suitable for checking that the quality of a metallic material, with or without corrosion protection, is maintained. Final text received or FDIS registered for formal approval. Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles.
We did tests of our products under ISO The salt spray or salt fog test is a standardized and popular corrosion test method, used to check corrosion resistance of materials and surface coatings.
Website design by Peter Bourne Communications.
Salt spray test – Wikipedia
Salt spray testing is kso because it is relatively inexpensive, quick, well standardized, and reasonably repeatable.
Hot-dip galvanizing produces zinc carbonates when exposed to a natural environment, thus protecting the coating metal and reducing the corrosion rate.
The most common test for steel based materials is the Neutral Salt Spray test often abbreviated to NSS which reflects the fact that this type of test solution is prepared to a neutral pH of 6. George Gorecki – Naperville, Illinois A. It also describes the method employed to evaluate the corrosivity of the test cabinet environment.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against.
You need to upgrade your browser You are using Internet Explorer 8 This is considered an out of date browser.