The salt spray (or salt fog) test is a standardized and popular corrosion test method, used to ASTM B was the first internationally recognized salt spray standard, originally published in Other important relevant standards are. Designation: B – 07a Standard Practice for Operating Salt Spray (Fog) Apparatus1 This standard is issued under the?xed designation B. ASTM B Testing, also known as a Standard Practice for Operating Salt ASTM B Testing requires controls over many operational parameters such as: .
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Nozzles calibrated for air consumption and solution-atomized are available. If these conditions are met, you can assume that your machine runs fine. This standard has been approved for use by agencies of the Department of Defense. Your b117-7a are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Test solution tank L.
salt spray test, ASTM B, corrosion tests
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 b1117-07a. When the pH of the salt solution is adjusted at room temperature, it is therefore necessary to adjust it below 6.
Otherwise cleaned air may be introduced into the bottom of a tower?
For example, a typical electroplated zinc and yellow passivated steel part lasts 96 hours in salt spray test without white rust. When using a speci?
This climate is maintained under constant steady state conditions. The pH of the collected solution shall be 6. The fallout rate should be measured for 16 hours and it must range from 1. Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and reasonably repeatable. However, these b17-07a standards neither provide information of testing periods for the coatings to be evaluated, nor the appearance of corrosion products in form of salts.
Although there may be a weak correlation between the duration asstm 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. This is followed by 0. A solution that requires between 3. Care shall be taken that specimens are not recontaminated after cleaning by excessive or careless handling. NOTE 7—If the tower is run outside of these suggested temperature and pressure ranges to acheive proper collection rates as described in Sodium chloride containing anti-caking agents shall not be used because such agents may act as corrosion inhibitors.
Although the majority of salt spray tests are continuous, i. The chamber has the following features: The procedure involves the exposure of astmm test panels and the determination of their mass losses in a speci?
Current edition approved Dec. ASTM International takes no position respecting the validity b117-007a any patent rights asserted in connection with any item mentioned in this standard. For this purpose Test Method B and Practice G 85 are available, which are also considered by some to be superior for comparison of chemically treated aluminum chromated, phosphated, or anodizedalthough? The pH measurement shall be made as described in 8.
ASTM-B STANDARD PRACTICE FOR OPERATING SALT SPRAY (FOG) APPARATUS_百度文库
B In order to ensure that the proper salt concentration was achieved when mixing the solution, it is recommended that the solution be checked with either a salimeter hydrometer or speci? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another. If the salt used is of lower purity, then atsm for halides.
Accessories for Corrosion Testing. ISO standards by standard number. The number of nozzles depends on type and capacity and is related to the area of the test space. Construction of a plastic nozzle, such as is furnished by several suppliers, is shown ashm Fig.
Specimens shall preferably be supported from the bottom or the side. This produces a corrosive environment of dense salt water fog also referred to as a b17-07a or spray in the chamber, so that test samples exposed to this environment are subjected to severely corrosive conditions.
The company was founded in and from the very beginning it started working on innovative design concepts for test chambers. Mix mL of hydrochloric acid sp gr 1. Vent piping should be of sufficient size so that a minimum of back pressure exists and should be installed so that no solution is trapped. See Table 1 for a listing of these impurity restrictions. This spray is set to fall-out on to the specimens at a rate of 1.
A number in parentheses indicates the year of last reapproval. Most commonly, the time taken for oxides to appear on the samples under test asgm compared to expectations, to determine whether the test is passed or failed. Wstm attention should be given to the chemical content of the salt.
An 11 to 19 L 3 b117-07s 5-gal reservoir is required within the chamber, with the level controlled.
Evaluation of Results Test solution tank L. The first prerequisite for your test chamber to operate properly is that it is regularly serviced and well maintained. Continuity of Exposure In this connection it is well to point out that Practice B is b11-07a applicable to the study or testing of decorative chromium plate nickel-chromium on steel or on zinc-base die castings or of cadmium plate on steel.
Salt spray test
This is followed by 2. Continuous operation implies that the chamber be closed and the spray operating continuously except for the short daily interruptions necessary to inspect, rearrange, or remove test specimens, to check asmt replenish the solution in the reservoir, and to make necessary recordings as described in Section In either case, the exposure to salt spray may be salt water spray or synthetic sea water prepared in accordance with the requirements of the test standard.
Nozzles may be located at the b117-07s, or 0.