MIL-STD 883 Salt Corrosion Test-Corrosion Test Machine
The MIL-883 salt corrosion test is an accelerated laboratory corrosion test designed to simulate the effects of coastal atmosphere on equipment and packaged components. This test involves exposing a sample to specific conditions, such as temperature, humidity, and salt concentration, to assess its resistance to corrosion and durability. Test results can help engineers and designers identify potential material defects and weaknesses so they can take appropriate protective measures during product design and manufacturing.
Corrosion is when the coating, the base metal, or both are damaged by chemical or electrochemical action. Corrosion sites refer to the specific locations where these materials are corroded, and corrosion stains are translucent deposits formed due to corrosion products.
Corrosion products (or deposits) are the result of corrosion processes and may include rust, iron oxide, nickel oxide, tin oxide, etc. These products may accumulate at the site of corrosion, or they may flow and cover the area that has not been corroded by the action of the liquid carrier.
The foaming phenomenon refers to the local expansion and separation between the coating and the base metal. Pinholes are small holes that appear in the coating and are a defect that can penetrate the coating completely. Pitting is the local corrosion of the coating or base metal, usually appearing as a small cavity. Peeling occurs when small pieces of the coating fall off, exposing the base metal.
Depending on the size of the container and the specified test conditions, multiple tests can be carried out before cleaning. For longer-duration tests, the primary container can be refilling through the secondary container to avoid interrupting the test cycle. At the end of the cleaning cycle, when the chamber is restarted, the container is filled with salt solution. By manipulating the chamber until the temperature reaches equilibrium, the chamber will remain in a stable state.
If the laboratory is out of operation for more than a week, the remaining salt solution (if any) must be discarded. The laboratory must then be cleaned before being restarted. Intermittent operation of the laboratory is acceptable as long as the pH value and concentration of the salt solution are kept within the prescribed limits.
A salt solution. In deionized or distilled water, the salt concentration shall be 0.5% to 3.0% by weight in order to achieve the noise reduction required by Article 314. The salt used should be sodium chloride containing dry salt. More than 0.1% of the total weight of sodium iodide and less than 0.3% of the total weight of impurities. When measuring at 95'F±5'F(35° C-3 'C), the pH of the salt solution should be maintained between 6.5 and 7.2. Only use CP grade (dilute solution) hydrochloric acid or sodium hydroxide to adjust pH.
Unless otherwise stated, test samples do not require pre-processing. If necessary, initial bending stress treatment can be performed on the device leads prior to installation. If the device under test has already completed the required preliminary processing in other tests, there is no need to bend the lead again.
1.Dual in line noolnnoo with londe ottachod to or ovitine feom noolnoo oidon louoh no aide hrosod nooknnon ond ceramic dual-in-line packages): Lid upward 15° to 45 from vertical are located shall be oriented upward at an angle greater than or equal to 15° from vertical sses on which the leds
2.Packages with leads attached to, or exiting from the opposite side of the lid (such as TO cans, solid sidewall packages, and metal platform packages): Lid 15 to 45 from vertical, One-half of the samples shall be tested with the lid upward; the remaining samples shall be tested with the leads upward (see figure 1009-1b). For packages with leads attached to, or exiting from the same side as the lid, only one orientation (lid and leads upward) is required.
3. Packaging that is connected with leads parallel to the lid or protruding from the side of the packaging (such as flat packaging): the lid is 15° to 45° vertical. The side of the package where the lead is located should be oriented upward, with an Angle of 15° or greater from the vertical direction. For metal shell packaging, half of the sample should be tested with the lid facing up; The remaining samples should be tested face up. All other packaging should be tested with the lid facing up.
4. Lead-free and leaded chip carrier: cover from vertical 15° to 45°. Half of the sample should be tested upward; The remaining sample should be tested with the lid facing down.
Corrosion is when the coating, the base metal, or both are damaged by chemical or electrochemical action. Corrosion sites refer to the specific locations where these materials are corroded, and corrosion stains are translucent deposits formed due to corrosion products.
Corrosion products (or deposits) are the result of corrosion processes and may include rust, iron oxide, nickel oxide, tin oxide, etc. These products may accumulate at the site of corrosion, or they may flow and cover the area that has not been corroded by the action of the liquid carrier.
The foaming phenomenon refers to the local expansion and separation between the coating and the base metal. Pinholes are small holes that appear in the coating and are a defect that can penetrate the coating completely. Pitting is the local corrosion of the coating or base metal, usually appearing as a small cavity. Peeling occurs when small pieces of the coating fall off, exposing the base metal.
Procedures for optimal salt corrosion test
The first step is to ensure that the test room in the salt spray lab is adequately cleaned and maintained. This helps to eliminate any material that may affect subsequent test results. At 95°F ±5°F, the test chamber is cleaned using deionized or distilled water, the specific cleaning time can be adjusted as needed. This cleaning operation should be performed after each use of the salt solution in the reservoir.Depending on the size of the container and the specified test conditions, multiple tests can be carried out before cleaning. For longer-duration tests, the primary container can be refilling through the secondary container to avoid interrupting the test cycle. At the end of the cleaning cycle, when the chamber is restarted, the container is filled with salt solution. By manipulating the chamber until the temperature reaches equilibrium, the chamber will remain in a stable state.
If the laboratory is out of operation for more than a week, the remaining salt solution (if any) must be discarded. The laboratory must then be cleaned before being restarted. Intermittent operation of the laboratory is acceptable as long as the pH value and concentration of the salt solution are kept within the prescribed limits.
A salt solution. In deionized or distilled water, the salt concentration shall be 0.5% to 3.0% by weight in order to achieve the noise reduction required by Article 314. The salt used should be sodium chloride containing dry salt. More than 0.1% of the total weight of sodium iodide and less than 0.3% of the total weight of impurities. When measuring at 95'F±5'F(35° C-3 'C), the pH of the salt solution should be maintained between 6.5 and 7.2. Only use CP grade (dilute solution) hydrochloric acid or sodium hydroxide to adjust pH.
Unless otherwise stated, test samples do not require pre-processing. If necessary, initial bending stress treatment can be performed on the device leads prior to installation. If the device under test has already completed the required preliminary processing in other tests, there is no need to bend the lead again.
nstallation of sample
The test sample shall be mounted on a fixture (plexiglass rod, glass or fiberglass screen, glass wire, etc.) in the following applicable directions. So should the specimen. They are placed so that they do not touch each other, so that they do not shield each other from freely settling fog, so that corrosion products and condensates from one sample do not fall on the other sample.1.Dual in line noolnnoo with londe ottachod to or ovitine feom noolnoo oidon louoh no aide hrosod nooknnon ond ceramic dual-in-line packages): Lid upward 15° to 45 from vertical are located shall be oriented upward at an angle greater than or equal to 15° from vertical sses on which the leds
2.Packages with leads attached to, or exiting from the opposite side of the lid (such as TO cans, solid sidewall packages, and metal platform packages): Lid 15 to 45 from vertical, One-half of the samples shall be tested with the lid upward; the remaining samples shall be tested with the leads upward (see figure 1009-1b). For packages with leads attached to, or exiting from the same side as the lid, only one orientation (lid and leads upward) is required.
3. Packaging that is connected with leads parallel to the lid or protruding from the side of the packaging (such as flat packaging): the lid is 15° to 45° vertical. The side of the package where the lead is located should be oriented upward, with an Angle of 15° or greater from the vertical direction. For metal shell packaging, half of the sample should be tested with the lid facing up; The remaining samples should be tested face up. All other packaging should be tested with the lid facing up.
4. Lead-free and leaded chip carrier: cover from vertical 15° to 45°. Half of the sample should be tested upward; The remaining sample should be tested with the lid facing down.
Salt atmosphere compliance test length
The minimum exposure time for salt spray tests is specified by the test conditions letter in the table below. Unless otherwise specified, test condition A shall be used for optimal salt spray tests.
What can we offer?
JOEO is a manufacturer of corrosion test machine in China, with more than 20 years of research and development and production experience. Our equipment is capable of conducting temperature, humidity and salt spray tests simultaneously. corrosion test machine adopts 5mm or 8mm imported gray white impact resistant P.V.C plate, high temperature resistance up to 85℃, and has good corrosion resistance. The nozzle (PYREX) is made of special glass, which ensures that the mist spreads evenly and can be used continuously for 4,000 hours without crystallization. If you are interested in salt spray testing or related equipment, please feel free to contact our sales engineers.
