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?.
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But regardless of what you think or I think, tests don’t have any merit if they include uncontrolled variables. This page was last edited on 29 Octoberat What it does NOT tell how long any part should last in salt spray, nor does is tell what is considered a passing test. A discussion started in but continuing through Q. So I will start with benchmark with these two standards. The test duration is variable. Hi David, There are several differences between the two specifications, including salt concentration range, salt analysis, water quality, angle of inclination of test panels, corrosivity requirements, I think the temperature is about the only thing that has been standardised.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and normaa repeatable. This is compared to expectations, to determine whether the test is passed or failed.
We did tests of our products under ISO 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.
Most commonly, the time taken for oxides to appear on the samples under test is compared to expectations, to determine whether the test is passed or failed. Variations to the salt spray test solutions depend upon the materials to be tested. We have a customer, that we supply some zinc electroplated mechanical components to. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time.
Cyclic corrosion testing is better suited to this. From Wikipedia, the free encyclopedia. ASTM G85 annex A1 — Acetic Acid Salt Spray Test non-cyclic This test can be used to determine the relative noma 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.
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I would expect 10 hours per day to be more severe because the parts will be in the test chamber for 2. If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with. Dear Brian and Davey, Thank you very much for your answers. For example, a typical electroplated zinc and yellow passivated steel part lasts 96 hours in salt spray test without white rust. March 16, A.
The end-point of the test is often user-driven. Hence it won’t say how long to test for, nor how thick your zinc plating must be to pass, nor whether it needs to be chromated or not, etc. ASTM B is an excellent reference document for the salt spray practitioner, with many helpful hints and tips contained in its useful appendixes.
Salt spray test – Wikipedia
In reference to Bill’s reply. The salt spray test is one of the most widespread and long established corrosion tests. Other test solutions b17 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.
This is just food for thought, not a scenario I fully embrace, but consider: The test duration is variable. What is major difference between ISO [link by ed. Please note The test standard summaries are for general guidance only. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
This awtm can be used to test the relative resistance to corrosion paints on steelwhen exposed to a changing climate of dilute salt spray at ambient temperature, followed by air drying at and elevated temperature.
ASTM B117 Salt Spray Testing
In the automotive industry requirements are specified under material specifications. 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 solution is prepared to a neutral pH of 6.
Is there any equivalence between this two standards? ASTM B was the first internationally recognized salt spray standard, originally published in Have we given galvanized finishes the fresh air they need? I’ll really appreciate your help Such tests are commonly referred to as modified salt spray tests.
First of two simultaneous responses — A. 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. What is typical acceptance criteria for salt spray testing. A personal good afternoon to all, I am Jose of Curitiba, I am a painting inspector, I am a specialist in the area of Salt Spray, and have a problem and knowing of the competence of all readers in corrosion, perhaps they can help me.
George Gorecki – Naperville, Illinois. Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle.
Test specimens are placed in 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. Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles. This test is also referred to as 1b17 ASS test.
Typical Application This test can be used to test the relative resistance to corrosion of coated and uncoated metallic specimens, when exposed to a salt spray climate at an elevated temperature. Views Read Edit View history.