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: .
|Published (Last):||22 June 2007|
|PDF File Size:||5.51 Mb|
|ePub File Size:||15.83 Mb|
|Price:||Free* [*Free Regsitration Required]|
Individual reprints single or multiple copies of this standard may b117-70a obtained by contacting ASTM at the above address or at phonefaxor service astm. These standards describe the necessary information to carry out this test; testing parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pHetc.
Test solution tank L. The most appropriate test cycle and spray solutions are to be agreed between parties. Asmt 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.
The number of cycle repeats and therefore the test duration is variable. Unit for filtering compressed air. This test can be used to test the relative resistance to corrosion of aluminium alloys when exposed to a asmt climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
The salt spray test is one of the most widespread and long established corrosion tests. 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.
The distribution of the salt fog inside the test chamber has to be regularly checked. See Table 1 for a listing of these impurity restrictions. Otherwise, the test specimens shall consist of steel meeting the requirements of Practice D and shall be cleaned and prepared for coating in accordance with the applicable procedure of Practice D If these conditions are met, you can assume that your machine runs fine.
SaliCORR® ASTM B117 Sodium Chloride 5 kg bags
Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another. Accessories for Corrosion Testing. Requirements are agreed between customer and manufacturer. NOTE 4—The freshly prepared salt solution may be? Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle. The principle application of the salt spray test is therefore enabling quick comparisons to be made between actual and expected corrosion resistance.
This test is also referred to as an ASS test. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Variability has been observed when similar specimens are tested in different fog chambers even though the testing conditions are nominally similar and within the ranges speci? Originally approved in The procedure involves the exposure of steel test panels and the determination of their mass losses in a speci?
This is followed by 2. Suitably located and directed spray nozzles avoid ceiling accumulation and drip. Although the majority of salt spray tests are continuous, i. It is generally desirable to control the temperature of the surroundings of the b117-077a spray chamber and to maintain it as stable as possible.
Careful attention should be given to the chemical content of the salt. A common method of introducing the air is through an air dispersion device X1. How can I check whether my salt spray test chamber operates properly?
Spraying of test solution. In either case, the exposure to salt spray may be salt water spray or synthetic sea water b11-707a in accordance with the requirements of the test standard. Nozzles may be located at the ceiling, or 0. The pH measurement shall be made as described in 8.
ASTM-B STANDARD PRACTICE FOR OPERATING SALT SPRAY (FOG) APPARATUS_百度文库
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The first climate cycle comprises a continuous indirect spray of neutral pH 6. Mix mL of hydrochloric acid b11-707a gr 1.
However, in order to obtain reliable results additional requirements must be met. Table asmt shows the temperature, at different pressures, that are commonly used to offset the cooling effect of expansion to atmospheric pressure.
All other water will be referred to as reagent grade. Results are represented generally as testing hours in NSS without appearance of corrosion products e. Suitable apparatus which may be used is described in Appendix X1. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Pending a complete understanding of air-pressure effects, and so forth, it is important that the nozzle selected shall produce the desired condition when operated at the air pressure selected. 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.
If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with. This design principle provides, in contrary to the test chambers made of glass reinforced plastic, much better thermal conductivity which is the prerequisite for the reproducibility of the test atmospheres in modern corrosion test procedures.