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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ASTM B was the first internationally recognized salt spray standard, originally published in Chamber volumes vary from supplier to supplier. ASTM G85 is the most popular global test standard covering modified salt spray tests.
Equivalence between ASTM B-117 vs. ISO 9227 NSS
Proof sent to secretariat or FDIS ballot initiated: Most commonly, the time taken for oxides cin appear on the samples under test is compared to expectations, to determine whether the test is passed or failed.
This spray is set to fall-out on to the specimens at a rate of 1. The first climate cycle comprises a continuous indirect spray of neutral pH 6.
Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles. Corrosion tests and standards: If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with.
ISO – Corrosion tests in artificial atmospheres — Salt spray tests
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. These acidified test solutions generally have a pH of 3. Check out our FAQs.
ASTM G85 annex A1 — Acetic Acid Salt Spray Isi non-cyclic This test can be used to determine the relative resistance to corrosion of decorative chromium plating on steel and zinc based die casting when exposed to an acetic acid salt spray climate at an elevated temperature.
Although the majority of salt spray tests are continuous, i. Different coatings have 922 behavior in salt spray test and consequently, test duration will differ from one type of coating to another.
ns Is there any equivalence between this two standards? Brian Terry has directly answered your question, but please post your situation rather than an abstract question so that readers can best help you. The salt spray methods are all suitable for checking that lso quality of a metallic material, with or ios corrosion protection, is maintained. The test duration is variable. This is followed by 1. 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.
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.
Equivalence between ASTM B vs. ISO NSS
The second climate cycle comprises 0. Options include the following: The salt spray or salt fog test is a standardized and popular corrosion test method, used to check corrosion resistance of materials and surface coatings. However, these testing standards neither provide information of testing periods for the coatings to be evaluated, nor the appearance of corrosion products in form of salts.
Hi Sergio, ASTM B does not address corrosion behavior of test specimens, but describes the parameters for conducting a salt spray test.
Salt spray test
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 3 part repeating cycle. 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. 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.
So if you want to know how to set up a salt spray nes or how to make the salt solution, then B is a reference. This produces a corrosive environment of dense salt water fog also referred to as a mist or spray in the chamber, so that test samples exposed to this environment are subjected to severely corrosive conditions.
This test can be used to test the relative resistance to corrosion of aluminium alloys when exposed to a changing climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
But benchmarking performance is something altogether different. I suggest that you send some parts out for testing according to the ISO standard to see if they meet the spec.