Trying to interpret mildtl5541f in regards to whether electrical resistance testing is a requirement or not to be done on our class 3 panels every month. The military specification referred to as mildtl5541, military specification, chemical. Figure contact electrical resistance test pattern. Need electrical resistance testing per mildtl5541 or mil.
Contact ens technology regarding chromate conversion coating mil dtl 5541 today. Concentration, ph and temperature within manufacturers. When under a nominal electrode pressure of 200 psi, class 3 coatings are qualified under mildtl81706 to have a resistance not greater than 5,000 microhms per square inch as supplied and 10,000 microhms per square inch after 168 hours of salt spray exposure. The average resistance of bare aluminium are around 0. The test method, frequency of testing, and required.
Applied to test panel at 10 specified areas shown in figure 3 of standard. Class 3 for protection against corrosion where low electrical resistance is required. Provides protection against corrosion where low electrical resistance is required. Need electrical resistance testing per mil dtl 5541 or mildtl81706 september 17, 2009.
Mildtl5541 requires coatings survive 1 week exposure per astm. The test method, frequency of testing, and required resistance values shall be specified by the acquisition activity to meet the needs of a particular application see 6. Electrical resistance testing of milc5541 chromate. Bath chemistry sourced from qpl81706 approved source. A nominal electrode pressure of 200psi, upper electrode of 25 mm2 and the lower electrode of greater surface area. Mildtl5541 chemical films for aluminum and alumi num alloys. Is there a white paper or guide out there that when and why type i really needs to be used i have a person at work that thinks that type ii is colorless and is using type i with out really being needed to provide color. Electrical contact resistance testing shall be as specified in the contract or order see 6. I am looking for information on chemical conversion coatings on aluminum and aluminum alloys. Electrical resistance of chromate conversion coating class. I need to know when to use type i and not to use type i finish.
Mildtl5541f chemical conversion coatings on aluminum and. A discussion started in 1995 and continuing through 2001. Determination of electrical resistance based on mil dtl 5541 section 6. The resistance is measured using a modified kelvin bridge. Does the manufacturer indicate it will meet milc5541, class 3 requirements. Assured testing services is capable of providing corrosion testing iaw. I would like to know how electrically conductive the surfaces of my aluminum and zinc parts are when i get them back from chem film coating. Durability of corrosion protection coatings for aluminum osti. Electrical contact resistance testing in mildtl5541. Need electrical resistance testing per mildtl 5541 or mildtl81706 september 17, 2009.
All assured cyclic chambers are plc controlled, allowing 247 automated exposure and providing uniform, repeatable results each test cycle. Electrical contact resistance for class 3 coatings. Class 1a coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion. Not measurement sensitive mildtl5541f 11 july 2006. Test results on file for fedstd141 wet tape adhesion testing.
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