ISO NSS. adv. auto technology banner. A discussion started in but continuing through Q. We have a customer, that we supply some zinc. Information to the interpretation of the result. The salt spray test is done according to DIN EN ISO (NSS). The paint thickness is measured. 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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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. Hi David, There are several differences between the two specifications, including salt concentration range, salt analysis, water quality, angle of inclination of test panels, corrosivity requirements, I think izo temperature is about the only thing that has been standardised. This produces a corrosive environment of dense salt water fog ios referred to as a mist or spray in the chamber, so that test samples exposed io this environment are subjected to severely corrosive conditions.
Is there any equivalence between this two standards? Dear Brian and Davey, Thank you very much for your answers. March 16, A. This is followed by 1. It also describes the method employed to evaluate the corrosivity of the test cabinet environment. This is followed by 3. Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle.
Diin example, a typical electroplated zinc and yellow passivated steel part lasts 96 hours in salt spray test without white rust. Options include the following:.
From beautiful Pine Beach New Jersey: We did tests of our products under ISO ASTM G85 is an example of a test standard which contains several modified salt spray tests which are variations to the basic salt spray test. 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. Such details are provided in the appropriate product specifications.
Toby Padfield – Troy, Michigan.
This is followed by 0. I’ll really isp your help A personal good afternoon to all, I am Jose of Curitiba, I am a painting inspector, I am a specialist in the area of Salt Spray, and have a problem and knowing of the competence of all readers in corrosion, perhaps they can help me.
Salt spray testing is an accelerated corrosion test that produces a corrosive attack to coated samples in order to evaluate mostly comparatively the suitability of the coating for use as a protective finish.
ASTM G85 is the most popular global test standard covering modified salt spray tests. Options include the following: If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with.
Salt spray test
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.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 3 part repeating cycle. The most appropriate test cycle and spray solutions are to be agreed between parties.
Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another.
ASTM B was the first internationally recognized salt spray standard, originally published in The test duration is variable. 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.
This climate is maintained under constant steady state conditions. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time.
What is major difference between ISO [link dn ed. ASTM does not address this issue, but ISO does not recommend it and if it is to be done, advocates a thorough cleaning.
Salt spray tests in accordance with DIN EN ISO NSS / AASS / CASS | IGOS, Solingen
Hot-dip galvanizing produces zinc idn when exposed to a natural environment, thus protecting the coating metal and reducing the corrosion rate. There is a general historical consensus that larger chambers can provide a em homogeneous testing environment.
Brian Terry has directly answered your question, but please post your situation rather than an abstract question so that readers can best help you.
Although nzs may be a weak correlation between the duration in salt spray test and the expected life of a coating in certain coatings such as hot dip galvanized steelthis test has gained worldwide popularity due to low cost and quick results.
This acceleration arises through the use of chemically altered salt spray solutions, often combined with other test climates and in most cases, the relatively rapid cycling of these test climates over time. Synthetic seawater solutions are also commonly specified by some companies and standards.
Salt spray test – Wikipedia
Requirements are agreed between customer and manufacturer. 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.
So I will start with benchmark with these two standards.
What do you want to test? That’s the only way to know for sure. Any ISO standard is available for this Testing? This page was last edited on 29 Octoberat Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly.