Meaning of neutral salt spray test
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Salt spray testing (fog) is popular because it is well standardized and reasonably repeatable. Salt spray tests are widely used in the industrial sector, marine, automotive, air craft, and military equipment for the evaluation of corrosion resistance of parts or finished surfaces. Salt spray testing is useful as in QC to detect poor coatings, and it allow some qualitative comparisons (at least, between coatings of the same material – not so good between different coating types). Salt spray testing is useful as in QC to detect poor coatings, and it allow some qualitative comparisons (at least, between coatings of the same material – not so good between different coating types).
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Jan 01, 2016 · Neutral Salt Spray Testing NSS testing uses the oxygen-concentration cell corrosion mechanism to accelerate corrosion for use in performance analysis on a variety of substrates and coatings. Adding sodium chloride (NaCl) at a concentration of 5 percent keeps the corroded metal ions in solution so that they can act as conductors to enhance the corrosive effect. May 01, 2017 · Salt spray testing is utilized as a form of a corrosion test for many coatings, but in most EN applications, it represents more of a porosity test than anything else. Meeting or surpassing 100 hours for medium Phos EN is certainly at its upper range of capability.
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Salt Spray is a method used for pretreatment and paint qualification, as well as quality assurance purposes. People speak of their paint specification being 1000 hours salt spray, but what does this really mean? Without criteria for evaluation, all this means is the painted part was placed in a salt spray cabinet for 1000 hours.
The salt spray test is an accelerated corrosion test used to measure the comparative corrosion resistance of materials exposed to a salt spray or salt fog at high temperature. This corrosion test is intended to provide corrosion resistance information on metals and coated metals. Salt spray testing is performed by placing samples in a test chamber designed in accordance with ASTM B117 and operated in accordance with the specified conditions in ASTM B117. The test solution to be sprayed is prepared by dissolving pure sodium chloride into pure water, in a ratio of 5% sodium chloride to 95% water, by weight.
For one thing, parts tested in a salt-spray cabinet are continuously wet, while those parts on a vehicle experience periods of wetness and dryness. Another difference between the conditions in a salt spray test and real-world conditions is the salt concentration. Neutral salt spray uses 5% sodium chloride solution with a pH range of 6.5 – 7.2 while being atomized under a controlled environment ( similar to an ASTM B117 test method). Acetic acid salt spray uses the same 5% salt solution with the exception of glacial acetic acid to lower the pH range to about 3.1 – 3.3. In this study, the effect of long-term neutral salt spray (NSS) exposure (i.e., 50 g/L concentration of salt solution at 25 °C) on the retained strengths of Zr–Ti coated and bare lap-shear aluminum joints bonded with hem flange adhesive Henkel Terokal 8021 NB was investigated. 500 hour salt spray corrosion resistance test. The ASTM B 117-95 testing procedure is the HVAC industry standard method of testing the acceptability and longevity of a paint finish. For the test, panels are placed in a 5% salt spray and fog atmosphere for measured periods of time. The test is usually A neutral salt spray test (NSS) is performed to determine qualitative resistance to corrosive attack on the products surface. This test is commonly employed on protective coated products.