MIL-STD-202H.pdf - 第13页
MI L - S TD - 202 - 101 CO NT E N T S PARAGRAPH PAG E FOREW ORD … ………………………………………………………. ii 1. SCOPE 1 1.1 Purpose …… ………………… …………………. …… .. …………. 1 2. APPLICABLE D O C U M EN T S 1 3. DEFINTIONS 1 4. GENERAL RE Q UI R E…
MIL-STD-202-101
FOREWORD
1. This standard is approved for use by all Departments and Agencies of the Department of Defense.
2. This entire standard has been revised. This revision has resulted in many changes to the format, but the most
significant one is the splitting the document into test methods. See MIL-STD-202 for the change summary.
3. Comments, suggestions, or questions on this document should be emailed to std202@dla.mil or addressed to:
Commander, Defense Logistics Agency, DLA Land and Maritime, ATTN: VAT, P.O. Box 3990, Columbus, OH
43218–3990. Since contact information can change, you may want to verify the currency of this address
information using the ASSIST Online database at https://assist.dla.mil.
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MIL-STD-202-101
CONTENTS
PARAGRAPH PAGE
FOREWORD…………………………………………………………. ii
1. SCOPE 1
1.1 Purpose………………………………………….……..…………. 1
2. APPLICABLE DOCUMENTS 1
3. DEFINTIONS 1
4. GENERAL REQUIREMENTS 1
4.1 Apparatus………………………………………….…...…………. 1
4.1.1 Chamber................................................................... …………. 2
4.1.2 Salt solution reservoir……………………….………...…………. 2
4.1.3 Air supply…………………………………….……………………. 2
4.1.4 Salt solution……………………………….………………………. 2
4.2. Preparation of specimens…………………….…………………. 2
4.3. Procedure………………………………………..……..…………. 2
4.3.1 Maintenance and conditioning of test chamber….……………. 2
4.3.2 Location of specimens………………………………..…………. 3
4.3.3 Chamber operation………………………………………………. 3
4.4 Summary…………………………………………….....…………. 3
5. DETAILED REQUIREMENTS 3
5.1 Length of test……………………………………..………………. 3
5.2. Measurements……………………………………..…..…………. 4
6. NOTES 5
6.1 Supersession data………………………………………………. 5
FIGURE PAGE
1. Variations of specific gravity of salt (NaCl) solution with temperature… 4
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北测（上海）电子科技有限公司
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MIL-STD-202-101
METHOD 101
SALT ATMOSPHERE (CORROSION)
1. SCOPE
1.1 Purpose. The salt atmosphere test, in which specimens are subjected to a fine mist of salt solution, has
several useful purposes when utilized with full recognition of its deficiencies and limitations. Originally proposed as
an accelerated laboratory corrosion test simulating the effects of seacoast atmospheres on metals, with or without
protective coatings, this test has been erroneously considered by many as an all-purpose accelerated corrosion test,
which if "withstood successfully" will guarantee that metals or protective coatings will prove satisfactory under any
corrosive condition. Experience has since shown that there is seldom a direct relationship between resistance to salt
atmosphere corrosion and resistance to corrosion in other media, even in so-called "marine" atmospheres and
seawater. However, some idea of the relative service life and behavior of different samples of the same (or closely
related) metals or of protective coating-base metal combinations in marine and exposed seacoast locations can be
gained by means of the salt atmosphere test, provided accumulated data from correlated field service tests and
laboratory salt atmosphere tests show that such a relationship does exist, as in the case of aluminum alloys. (Such
correlation tests are also necessary to show the degree of acceleration, if any, produced by the laboratory test). The
salt atmosphere test is generally considered unreliable for comparing the general corrosion resistance of different
kinds of metals or coating-metal combinations, or for predicting their comparative service life. The salt atmosphere
test has received its widest acceptance as a test for evaluating the uniformity (specifically, thickness and degree of
porosity) of protective coatings, metallic and nonmetallic, and has served this purpose with varying amounts of
success. In this connection, the test is useful for evaluating different lots of the same product, once some standard
level of performance has been established. The salt atmosphere test is especially helpful as a screening test for
revealing particularly inferior coatings. When used to check the porosity of metallic coatings, the test is more
dependable when applied to coatings that are cathodic rather than anodic toward the basic metal. This test can also
be used to detect the presence of free iron contaminating the surface of another metal, by inspection of the corrosion
products.
2. APPLICABLE DOCUMENTS
This section not applicable to this standard.
3. DEFINTIONS
This section not applicable to this standard.
4. GENERAL REQUIREMENTS
4.1 Apparatus. Apparatus used in the salt atmosphere test shall include the following:
a. Exposure chamber with racks or fixtures for supporting specimens.
b. Salt-solution reservoir with means for monitoring an adequate level of solution.
c. Means for atomizing the salt solution, including suitable nozzles and compressed air supply.
d. Chamber-heating means and controls.
e. Means for humidifying the air at a temperature above the chamber temperature.
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