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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March 16, A.
We have a customer, that isp supply some zinc electroplated mechanical components to. Electroplated zinc-nickel steel parts can last more than hours in NSS test without red rust or 48 hours in CASS test without red rust Requirements are established in test duration hours and coatings shall comply with minimum testing periods.
Salt spray test – Wikipedia
ASTM B was the first internationally recognized salt spray standard, originally published in The salt spray methods are all suitable for checking that the quality of a metallic material, with or without corrosion protection, is maintained.
That’s the only way to know for sure. Retrieved from ” https: I am needing to know if a gradual table of corrosion in assay exists of Salt Spray, if this table exists and if anyone would be able to post it, I will be thankful.
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. The test duration is variable. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. 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. Results are represented generally as testing hours in NSS without appearance of corrosion products e.
Corrosion tests in artificial atmospheres – Salt spray tests
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. You will then need to talk to your customer about the possibility of using one specification in lieu of the other.
George Gorecki – Naperville, Illinois A. 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. We did tests of our products under ISO The first climate cycle comprises a continuous indirect spray of neutral pH 6.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle. I suggest that you send some parts out for testing according to the ISO standard to see if they meet the spec.
In the automotive industry requirements are specified under material specifications.
A discussion started in but continuing through Q. Monday to Friday – Something totally different like zinc-alloy plating, organic coatings, etc.
Requirements are agreed between customer and manufacturer. The most appropriate test cycle and sio solutions are to be agreed between parties. 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.
These acidified test solutions generally have a pH of 3. This climate is maintained under constant steady state conditions.
ISO standards by standard number. 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.
Although the majority of salt spray tests are continuous, i.
Equivalence between ASTM B-117 vs. ISO 9227 NSS
Cyclic corrosion testing is better suited to this. The principle application of the salt spray test is therefore enabling quick comparisons to be made between actual and expected corrosion resistance. 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.
ASTM G85 is the most e global test standard covering modified salt spray tests. The salt spray test has little application in predicting how materials or surface coatings will resist corrosion in the real-world, because it does not create, replicate or accelerate real-world corrosive conditions.
Testing periods range from a few hours e. But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against. 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 jso and knowing of the competence of all readers in corrosion, perhaps they can help me.
Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another.
Most commonly, the time taken for oxides to appear on the samples under test is compared to expectations, to determine whether the test is passed or failed. Final text received or FDIS registered for formal approval. I’ll really appreciate your help The salt spray test is one of the most widespread and long established corrosion tests. Is there isp equivalence between this two standards?
Painted surfaces with an underlying hot-dip galvanized coating can be tested according to this method. ASTM does not address this issue, but ISO does not recommend it and if 927 is to be done, advocates a thorough isoo. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time. The neutral salt spray NSS test particularly applies to – eb and their alloys, – metallic coatings anodic and cathodic- conversion coatings, – anodic oxide coatings, and – organic coatings on metallic materials.