![]() ![]() Carbon offers low frequency shielding and is used in applications such as metal detectors, for shielding musical instruments or grounding applications. The coatings are pigmented with highly conductive fillers to provide effective EMI/RFI shielding over a broad frequency range. To achieve electromagnetic compatibility inner surfaces of plastic enclosures are coated with conductive or shielding coatings. Thermally conductive gap fillers dissipate heat away from sensitive electronic devices by conducting the heat away to a heat sink, whilst conformal coatings protect the board from harsh environmental conditions such as salt spray, moisture and chemicals.Įnclosures are often made from plastics which offer no intrinsic protection from EMI or RFI. Contact the experts at Elite to find out how to apply the salt fog test to your product.Fothershield’s range of EMI shielding and thermal interface materials give the EMC engineer plenty of choice when looking to solve EMC problems.Īt board level shielding cans may be selectively applied to the problem area of the board either by soldering using Fothershield’s lead free solder, solder pastes and flux, or by using a fence to hold the can in place. The salt fog test is widely used because of its repeatability.Ĭorrosion is going to happen in a product’s life. The materials industry has chosen the salt fog test as a useful baseline that gives an indication of a corrosion vulnerability. ![]() Actual outdoor environments are even more variable at any time of day or in any environment. How Does Salt Fog Testing Correlate to the Real World?Ĭorrelation between a real-world environment and salt fog testing in a lab is difficult. The degree of material rusting, per ASTM D610 The degree of surface blistering, per ASTM D714 The level of coating adhesion, per ASTM D3359 The amount of corrosion creepage when a coated surface is scratched, per ASTM D1654 The test plan will specify the sample or samples to be tested, the specific standard to be applied, the duration of the test, and the pass/fail criteria to be used at the completion of the test.Īmong the parameters that can be observed in the test sample during the salt fog test: Large Cabinet, available for non-SO2 tests, 93"w x 48”d x 48” h Small Cabinet 42”w x 30”d x 36” h, available for SO2 tests in ASTM G85 tests The test plan developed by the customer and the Elite engineer will specify the duration of the testing and the pass/fail criteria used to determine the test’s result. Exposure is done in 24-hour blocks, with the number of repetitions determined by the type of material and its intended environment.Įffects of long-term salt exposure on exposed surfaces. They call for temperature maintained at 35⁰C in the test chamber as a mixture of 5% sodium chloride in ASTM D1193 Type IV water is introduced at specific air pressures. Of these, ASTM B117 and MIL-STD-810 are the most common. Standards for salt fog testing include:Īmerican Society for Testing and Materials (ASTM) B117 Elite’s long experience in salt fog testing gives its experts the tools to help you navigate what can be a difficult process. Automotive and aerospace applications make extensive use of salt fog testing to confirm the integrity of materials and coatings. ![]() Salt fog is a type of accelerated corrosion test that is performed to assess the comparative corrosion resistance of certain materials when exposed to salt fog or salt spray at increased temperature levels. Kyle Thompson and Chuck Thompson checking a salt fog test at Elite's lab. Other tests, including dust, chemical fluids, gravel, water, pressure variations, and explosive environments are available for products needing to meet specific requirements. A product and its exposed surfaces need to go through a gauntlet to meet the necessary qualities to get to market- of these, salt fog is the primary test. Salt fog testing allows new designs and coatings to be scrutinized in a controlled environment and is useful to determine the corrosion resistance of different metals and finishes.Įlite performs salt fog tests as part of its suite of climatic tests. The basic corrosion-resistance evaluation of material and its coating is salt fog testing.Ĭorrosion costs many millions of dollars annually and left unchecked can cause structural failure. But all are exposed to corrosive effects of weather, water, pollutants, and more. What do cars, trucks, boats, airplanes, lampposts, and socket wrenches all have in common? At first glance, it wouldn’t seem to be much. ![]()
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