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.

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2.2 NEUTRAL SALT SPRAY TEST The salt spray test is the common practice used to produce a corrosive attack to the coated samples to predict the suitability as a protective finish. The corrosion product appearance is evaluated after some period of time. Test Salt spray was first used for corrosion testing around 1914. In 1939, the neutral salt spray test was incorporated as ASTM B117.1 This traditional salt spray specifies a continuous exposure to a 5% salt fog at 35oC. During the course of 80 years of use, there have been many modifications and refinements to B117. In Neutral Salt Spray (NSS) according to ASTM B-117 or ISO 9227 and Cyclic Corrosion Testing according to the GM 9540 P standard were used for the assessment of corrosion resistance. Nanoceramic based conversion coating in the paintshop: Patrick Droniou, William E. Fristad and Jeng-Li Liang of Henkel Kgaa, Duesseldorf Germany and Henkel Corp. Madison Heights, Mi, USA look at this area of finishing technology