ASTM B is the most widely adopted standard for salt spray testing. This standard is issued under the fixed designation B; the number 2 For referenced ASTM standards, visit the ASTM website, , or. Anybody could tell me what’s ” ASTM B [link by ed. to spec at TechStreet] SALT SPRAY TESTING” for zinc coating? What’s the specification for testing?.
|Published (Last):||19 October 2016|
|PDF File Size:||12.86 Mb|
|ePub File Size:||17.93 Mb|
|Price:||Free* [*Free Regsitration Required]|
Equivalence between ASTM B-117 vs. ISO 9227 NSS
These acidified test solutions generally have a pH of 3. 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.
The salt fog fall-out rate is verified by using a minimum of two 80cm aztm funnels per salt spray atomiser, each inserted into a measuring cylinder graduated in ml. This climate is maintained under constant steady state conditions. Thanks to all who answered concerning my question.
This acceleration arises through the use of chemically altered salt spray solutions, often combined with other test climates and in asmt cases, the relatively rapid cycling of these test climates over time. George Gorecki – Naperville, Illinois A. Requirements are agreed between customer and manufacturer.
The first climate cycle comprises a continuous indirect spray of neutral pH 6.
Salt spray test – Wikipedia
You will then need to talk to your customer about the possibility of using one specification in lieu of the other. The chamber climate is maintained under constant steady state conditions. Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly.
But regardless of what you think or I think, tests don’t have any merit if they include uncontrolled variables. Salt spray testing is an accelerated noema 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.
Norja suggest to obtain a copy of the standard; you will find the answers to your questions there. Practitioners applying the ASTM B test standard are responsible for checking they are using the most appropriate version for their application.
But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against.
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 as an automatic climate cycling control system.
This website has been developed with modern browsers in mind to allow it to display at its best in a wide variety of viewing situations – including mobile viewing. In this case, it would have been Although there may be a weak correlation between the duration in salt spray test and the expected life of a coating in certain coatings such as hot dip galvanized steelthis test has gained worldwide popularity due to low cost and quick results.
Second of two simultaneous responses — A. That’s the only way to know for sure. It describes pH, specific gravity, collection rate, flow rates, temperatures, pressures, etc. ASTM does not address this issue, but ISO does not recommend it and if it is to be done, advocates a thorough cleaning. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time. Is there any equivalence between this two standards? Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution also referred to as fog or mist which falls-out on to the specimens at a rate of 1.
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. Hi Sandy, The “” indicates the year that the standard was revised. Something totally different like zinc-alloy plating, organic coatings, etc. Contact Ascott for Further Information. 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.
But benchmarking performance is something altogether different. What it does NOT tell how long any part should last in salt spray, nor does is tell what is considered a passing test. 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. The salt spray test is one of the most widespread and long established corrosion tests.
For this reason the salt spray test is most often deployed in a quality audit role, where, for example, it can be used to check the effectiveness of a normq process, such as the surface coating of a metallic part. Hi Rodney, There really aren’t many visual aids to help with this fog test not that I know of at least.
ASTM B117 Salt Spray Testing
What is major difference between ISO [link by ed. These standards describe the atsm information to carry out this test; aastm parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pHetc. Both are excellent browsers.
Toby Padfield – Troy, Michigan. Test Conditions Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution also referred to as fog or mist which falls-out on to the specimens at a rate of 1. Brian Terry has directly answered your n117, but please post your situation rather than an abstract question so that readers can best help you.
Variations to the salt spray test solutions depend upon the materials to be tested. Most Salt Spray Chambers today g117 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.
So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level.