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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ASTM B was the first internationally recognized salt spray standard, originally published in This acceleration arises through the use of chemically altered salt spray solutions, often combined with other test climates and in most cases, the relatively rapid cycling of these test climates over time.
Mix mL of hydrochloric acid sp gr 1. Copper content shall be less than 0. Other test solutions have other 1b17-07a added including adtm acid often abbreviated to ASS and acetic b1117-07a 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.
The conditions of making the scratch shall be as de? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Salt Spray Test Chambers. It should be noted there is usually not a direct relation between salt spray fog resistance and resistance to corrosion in other media, because the chemistry of the reactions, including the formation of?
ASTM-B STANDARD PRACTICE FOR OPERATING SALT SPRAY (FOG) APPARATUS_百度文库
The sodium chloride concentration may also be determined using a suitable salinity meter for example, utilizing a sodium ion-selective glass electrode or colorimetrically as follows. Options for corrosion chambers.
Testing periods range from a few hours e. Each set point and its tolerance represents an operational control point for equilibrium conditions at a single location in the cabinet which may not necessarily represent the uniformity of conditions throughout the cabinet. The test duration is variable. The atsm end of the vent pipe should be shielded from extreme air currents that may cause?
The zinc carbonates are not produced when a hot-dip galvanized specimen is exposed to a salt spray fog, therefore this testing method does not give an accurate measurement of corrosion protection.
SaliCORR® ASTM B Sodium Chloride
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. NOTE 3—Temperature affects the pH of a salt solution prepared from water saturated with carbon dioxide at room temperature and pH adjustment may be made by the following three methods: There is a general historical consensus that larger chambers can provide a more homogeneous testing environment.
Once a year the corrosivity of the salt spray test chamber has to be checked. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. How can I check whether my salt spray test chamber operates properly? Current edition approved Dec. Suitable apparatus which may be used is described in Appendix X1.
Regarding any new applications, it is essential to correlate the results of this practice with actual? 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.
This test 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.
Although the majority of salt spray tests are continuous, i. The values given in parentheses are for information only. Heating Blocks for Evaporators.
An 11 to 19 L 3 to 5-gal reservoir is required within the chamber, with the level controlled. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Halides Bromide, Fluoride, and Iodide other aztm Chloride shall constitute less than 0. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Position of Specimens During Exposure 7. If these conditions are met, you can assume that your machine runs fine. These acidified test solutions generally have a pH of 3.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Usually, the materials to be tested are metallic although stone, ceramics, and polymers may also be tested and finished with a surface coating which is intended to provide a degree of corrosion protection to the underlying metal.
The pH of the collected solution shall be 6. NOTE 12—Recommended exposure periods are to be as agreed upon between the purchaser and the seller, but exposure periods of multiples of 24 h are suggested. Nozzles calibrated for air consumption and solution-atomized are available.
Salt spray test
This climate is maintained under constant steady state conditions. It is preferred that control panels be provided that bracket the expected test specimen performance. The cleaning method shall awtm optional depending on the nature of the surface and the contaminants. The salt used shall be sodium chloride with not more than 0.
Test solution tank L complete with tankfilter,hose and fitting.
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. 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?
The major features of a walk-in type cabinet, which differs signi? Such tests are commonly referred to as modified salt spray tests.