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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That’s the only way to know for sure. Remember that accelerated testing is not a proper indication of real world performance. ASTM does not address this issue, but ISO does not recommend it and if it is to be done, e a thorough cleaning.
Equivalence between ASTM B vs. ISO NSS
Results are represented generally as testing hours in NSS without appearance of corrosion products e. Test specimens are placed nzs 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.
This is followed by 0. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
We did tests of our products under ISO We have a customer, that we supply some zinc electroplated mechanical components to. Monday to Friday – rin This climate is maintained under constant steady state conditions. Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and reasonably repeatable. The most appropriate test cycle and spray solutions are to be agreed between parties. A requirement that a component ‘pass’ an accelerated corrosion test isn’t often meaningful until the finishing spec tells you what that means: 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.
So I will start with benchmark with these two standards. Di which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against. The number of cycle repeats and therefore the test duration is variable. Hot-dip galvanizing produces zinc carbonates when exposed to a natural environment, thus protecting the coating metal and reducing the corrosion rate.
It has also been found suitable for testing anodic and organic coatings on aluminium. Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating idn. This test can be used to test the relative resistance to corrosion of coated or uncoated aluminium alloys and other metals, when exposed to a changing climate of acidified synthetic seawater spray, followed by a high humidity, both at an elevated temperature.
I suggest that you send some parts out for testing according to the ISO standard to see if they meet the spec. Testing cabinets are manufactured according to the specified requirements here. The principle application of the salt spray test is therefore enabling quick comparisons to be made between actual and expected corrosion resistance.
Regards, Ted Mooney, P. ISO gives the guidelines for proper measurement of corrosion resistance for hot-dip galvanized specimens. Although popular in certain industries, modified salt spray testing has in many cases been superseded by Cyclic corrosion testing CCT The type of environmental test chambers used for modified salt spray testing to ASTM G85 are generally similar to the chambers used for testing to ASTM Bbut will often have some additional features, such isl an automatic climate cycling control system.
There is a general historical consensus that larger chambers can provide a more homogeneous testing environment. Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles.
From Wikipedia, the free encyclopedia. Although the majority of salt spray 92227 are continuous, i. If xin is a minimum volume required by a particular salt spray test standard, this will be vin stated and should be complied with.
March 16, A. Options include the following: ASTM B was the first internationally recognized salt spray standard, originally published in May 21, A. Proof 2927 to secretariat or FDIS ballot initiated: 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. Chamber volumes vary from supplier to supplier.
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.
The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time. This is followed by 3. 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.
These acidified test solutions generally have a pH of 3. Such details are provided in the appropriate product specifications.
Equivalence between ASTM B-117 vs. ISO 9227 NSS
This page was last ddin on 29 Octoberat Brian Terry has directly answered your dih, but please post your situation rather than an abstract question so that readers can best help you.
So if you want to know how to set up a salt spray cabinet or how to make the salt solution, then B is a reference. Other test solutions have other chemicals added including acetic acid often abbreviated to ASS and acetic acid with copper chloride often abbreviated to CASS each one chosen for the evaluation of decorative coatings, such as electroplated copper-nickel-chromium, electroplated copper-nickel or anodized aluminum.