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.

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Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle. The salt spray tests are particularly useful for detecting discontinuities, such as pores and other defects, in certain metallic, organic, anodic oxide and conversion coatings. Something totally different like zinc-alloy plating, organic coatings, etc. George Gorecki – Naperville, Illinois A.

It also describes the method employed to evaluate the corrosivity of the test cabinet environment. For example, a typical electroplated zinc and yellow passivated steel part lasts 96 hours in salt spray test without white rust.

ISO | Standards | Ascott Analytical

You need to upgrade your browser You are using Internet Explorer 8 This is considered an out of date browser. Check out our FAQs. This test can be used to test the relative resistance to corrosion paints on steelwhen exposed to a changing climate of dilute salt spray at ambient temperature, followed by air drying at and elevated temperature.

The second climate cycle comprises 0. 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.

Variations to the salt spray test solutions depend upon the materials to be tested.

  ESHG 2013 PDF

We have a customer, that we supply some zinc electroplated mechanical components 927. The salt spray methods are all suitable for checking that the quality of a metallic material, with or without corrosion protection, is maintained.

What do you want to test?

Monday to Friday – Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and reasonably repeatable. 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. Both are excellent browsers. Toby Padfield – Troy, Michigan. Synthetic seawater solutions are also commonly specified by some companies and standards.

The test duration is variable. Though believed to be accurate at the time of writing, this may change over ido.

I suggest that you send some parts out for testing according to the ISO standard to see if they meet the spec. By using this site, you agree to the Terms of Use and Privacy Policy. But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against.

Chamber volumes vary from supplier to supplier. The first climate cycle comprises a continuous indirect spray of neutral pH 6.

Salt spray test

This is followed by 3. Hi Sergio, ASTM B does not address corrosion behavior of test specimens, but describes the parameters for conducting a salt spray test. Testing periods range from a few hours e. Dear Brian and Davey, Thank you very much for your answers. The salt spray test is one of the most widespread and long established corrosion tests. 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.

These acidified test solutions generally have a pH of 3. In this context they can be considered to be equivalent and interchangeable terms. 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, electroplating, galvanizing, and the like, on a comparative basis.


Equivalence between ASTM B-117 vs. ISO 9227 NSS

Please note The test standard summaries are for general guidance only. The salt fog fall-out rate is verified by using a 9272 of two 80cm 2 funnels per salt spray atomiser, each inserted into a measuring cylinder graduated in ml. The number of cycle repeats and therefore the test duration is variable. This is followed by 2. The zinc carbonates are not produced when a hot-dip galvanized specimen is exposed to a salt spray fog, therefore this testing method does not give an accurate measurement of corrosion protection.

But we haven’t supported older browsers like IE8. For this reason the salt spray test is most often deployed in a quality audit role, where, for example, it can be used to check the effectiveness of a production process, such as the surface coating of a metallic part. 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.

Brian Terry has directly answered your question, but please post your situation rather than an abstract question so that readers can best nss you.

Salt spray test – Wikipedia

ISO gives the guidelines for proper measurement of corrosion resistance for hot-dip galvanized specimens. You will then need to talk 99227 your customer about the possibility of using one specification in lieu of the other. So if you want to know how to set up a salt spray cabinet or how to make the salt solution, then B is a reference.