ASTM B117-2019 pdf free

08-04-2021 comment

ASTM B117-2019 pdf free.Standard Practice for Operating Salt Spray (Fog) Apparatus.
3.1 This practice provides a controlled corrosive environment which has been utilized to produce relative corrosion resislance inlormalion for specimens of metals and coated metals exposed in a given test chamber.
3.2 Prediction of performance in natural environments has seldom been correlated with salt spray results when used as stand alone data.
3.2.1 Correlation and extrapolation of comsion performance based on exposure to the test environment provided by this practice are not always predictable.
3.2.2 Correlation and extrapolation should he considered only in cases where appropriate corroborating long-term atmospheric exposures have been conducted.
3.3 The reproducibility of results in the salt spray exposure is highly dependent on the type of specimens tested and the evaluation criteria selected, as well as the control of the operating variables. In any testing program. sufficient replicates should be included to establish the variability of the results. 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 specitied in this practice.
4. Apparatus
4.1 The apparatus required for salt spray (fog) exposure consists of a fog chamber, a salt solution reservoir, a supply of suitably conditioned compressed air, one or more atomizing nozzles, specimen supports, provision for heating the chamber, and necessary means of control. The size and detailed construction of the apparatus arc optional, provided the conditions obtained meet the requirements of this practice.
4.2 Drops of solution which accumulate on the ceiling or cover of the chamber shall not be permitted to fall on the specimens being exposed.
4.3 Drops of solution which fall from thc specimens shall
1)01 be returned to the solution reservoir for respraying.
4.4 Material of construction shall be such that it will not affect the corrosiveness of the fog.
4.5 All waler used for this practice shall confirm to Type IV waler in Specification Dl l93 (except that for this practice limits for chlorides and sodium may be ignored). This does not apply to running tap water. All other water will he referred to as reagent grade.
Nm I —Water used with a conductisily l .0 pS/cm ttw resistivity ?l .0 Mcin may cause damage to some equipnwnl due to the reactive nature of ihe water. In addition. ii may cause issues ith stabiliting p11 measurenwnts.
5. Test Specimens
5.l The type and number of test specimens to be used, as well as the criteria for the evaluation of the test results, shall be defined in the specifications covering the material or product being exposed or shall be mutually agreed upon between the purchaser and the seller.
6. Preparation of Test Specinwns
6.1 Specimens shall be suitably cleaned. The cleaning method shall be optional depending on the nature of the surface and the contaminants. Care shall be taken that specimens are not recontaminated after cleaning by excessive or careless handling.
6.2 Specimens for the evaluation of paints and other organic coatings shall be prepared in accordance with applicable specifIcation(s) for the material(s) being exposed, or as agreed upon between the purchaser and the supplier. Otherwise, the lest specimens shall consist of steel meeting the requirements of Practice 1)609 and shall be cleaned and prepared for coating in accordance with the applicable procedure of Practice 1)609.
6.3 Specimens coated with paints or nonmetallic coatings shall not be cleaned or handled excessively prior to test.
6.4 Whenever it is desired to determine the development of
corrosion from an abraded area in the paint or organic coating,
a scratch or scribed line shall be made through the coating with
a sharp instrument so as to expose the underlying metal before testing. The conditions of making the scratch shall be as defined in Test Method D1654, unless otherwise agreed upon
between the purchaser and the seller.
6.5 Unless otherwise specified, the cut edges of plated,coated, or duplex materials and areas containing identification marks or in contact with the racks or supports shall be protected with a suitable coating stable under the conditions of the practice.ASTM B117 pdf download.

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