As established by mildtl5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. If there is a specification or process that is not listed, we welcome your inquiries. Combining alternative pretreatments and primers or selfpriming topcoats creates. The list below represents the processes and specifications that we perform and certify to most frequently. Available masking for selective surface chem filming salt spray corrosion test minimum 168 hours of salt spray resistance rohs compliant chem film mil dtl 5541 type 2 repair of anodized surfaces per mil a8625 bulk or individual processing. Available masking for selective surface chem filming salt spray corrosion test minimum 168 hours of salt spray resistance rohs compliant chem film mildtl5541 type 2 repair of anodized surfaces per mila8625 bulk or individual processing. Addresses compositions containing hexavalent chromium. Used as a postplating process, chemfilm provides an excellent paint adhesion and a superior base for bonding.
Class 3 for protection against corrosion where low electrical resistance is required. Electroless nickel plating per milc26074, astm b733, ams 2404. The process is called anodizing because the part to be treated forms the anode electrode of an electrical circuit. Milc81706 and been accepted for listing on the applicable qualified products. The military specification referred to as mildtl5541, military specification, chemical. Milc5541 did not mention type i or ii whereas mildtl5541 link is to free spec at defense logistics agency, dla. Chemical film coatings are gelatinous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of subsequent coatings such as paints and primers. Mil c 5541 mil dtl 5541 class 3 ams2474 astm b449 class 3 7.
Aluminum chromate conversion coatings per milc5541 mildtl5541 and. The mil dtl 5541 specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy. This was formerly known as milc5541 and is another of our alltime bestselling plating specs. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. Difference between milc5541 class 1a and mildtl5541. Has low coefficient of friction, and is resistant to heat.
Electroless nickel plating per mil c 26074, astm b733 and ams 2404. We are nadcap certified, as9100 c and itar registered. Plating mega industries, llc chromicoat l25 and iridite ncp. Chem corrosion resistant coating part number milc5541 nsn 8030014510284. Kit includes a quart of deoxidine 605 surface cleaner and deoxidizer, one quart. Technical data sheet anochem tcp anochem tcp replaces hexavalent chromate conversion coatings used for aluminum alloys without sacrificing corrosion resistance, electrical contact resistance or organic topcoat adhesion properties while meeting regulatory requirements of rohs, weee and elv legislation. This document is available in either paper or pdf format. Mildtl81706a 18 february 2002 superseding milc81706 30 june 1970 detail specification chemical conversion materials for coating aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. The best corrosion protection is provided by chem film permildtl5541 class 1a. Electroless nickel plating per milc26074, astm b733 and ams 2404. Milc5541 class 1a indicates maximum corrosion resistance and a more stringent corrosion test is specified. Wikiproject military history rated startclass this article is within the scope of the military history wikiproject. Class 3 however, also maintains electrical conductivity.
Milc5541 link is to free spec at defense logistics agency, dla. Fsc standardization area mffp metal finishes and finishing processes and procedures. This is a relatively thick coating used as a final finish or. Anodizing aluminum increases the corrosion and wear resistance. This kit was developed specifically for convenient touchup and corrosion. To find similar documents by federal supply class code. Anodizing is an electrochemical process used to increase the thickness of the natural oxide layer on the surface of aluminum parts. Depending on quantity, availability, condition, lead time, and possible discontinuation of an item, we cannot guarantee pricing until we provide you an up to date quote. Milc26074c 3 my les5 military specification this specification ie approved for we by all departfmnta and agencie8 of the oapartmmt of defense. Mil mil dtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding mil c 5541e standard by military specifications and standards, 07112006 amendments available. Aluminum chromate conversion coatings per milc5541 mildtl5541 and astm b44993 advanced plating technologies no longer offers chromate services. Iridite milc5541 mildtl5541 class 3 ams2474 astm b449 class 3 7. Excellent hardness rc6874, wear resistance, and erosion resistance. Table 2 details common plating options and the applicable specification.
Iridite chromate conversion coating finish milc5541. Mildtl5541, type i, class 3, hexavalent control mildtl5541, type. Mildtl5541f 11 july 2006 superseding milc5541e 30 november 1990 detail specification chemical conversion coatings on aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys this specification covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces.
The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. Description 650 chromital tcp is a rohs, reach compliant and qpl approved liquid chemical used to form a protective conversion coating on aluminum surfaces without the use of hexavalent chromium. Mila8625 type ii, class 1 ams1471 astm b580 type b thru f 7. Part number milc5541 including related part numbers and nsn starting at page 1. Class 1a chemical conversion coatings are intended. Mil c 5541e, mil dtl5541f, astm b 44993 2004, ams 2473g, ams 2474d and mil dtl. Although mildtl5541 has been superseded by more recent specifications, it still remains a specification approved by all agencies and departments in the us department of. Class 1a coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion protection and provide lower electrical surface resistance. Mildtl5541 is a military specification related to conversion coatings. Part number mil c 5541 including related part numbers and nsn starting at page 1. Mil c 5541 did not mention type i or ii whereas mil dtl 5541 link is to free spec at defense logistics agency, dla. The military specification referred to as mildtl5541, military specification, chemical conversion coatings on aluminum and aluminum alloys covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys.
Class 3 we can process to mildtl 5541 tyii clear chem film, rohs compliant. One of their writeups was that we were using the milc5541 link is to spec a. For mil dtl 5541, it is very clear when type ii is mentioned, the conversion coating shall not contain hexavalent chrome, hence, rohs compliant. Milc5541e, mildtl5541f, astm b 44993 2004, ams 2473g, ams 2474d and mildtl. Mildtl5541 chemical conversion coatings on aluminum. Zyci plating specifications general information page 9 reference only april 2018 chrome qq c 320 a coating for ferrous metals.
Mil c 5541 link is to free spec at defense logistics agency, dla. Another important quality is the ability to heal small scratches due to being soluble. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mildtl5541f class 3. Military specification this specification ie approved for. Qpl number 81706 mil c 5541 document id mil dtl81706b, type ii, class 1a, form i, method c. For type i applications mega uses chromicoat l25, a hexavalent chromium product that is certified for use by numerous aerospace and military organizations for applications within the harshest of environments. Class 1a for maximum protection against corrosion, painted or. Determine the suitability of trivalent chromium conversion coatings that meet the requirements of mildtl5541, type ii, for use in applications where highfrequency electrical. Dtm no conversion coating or with milc5541 class 1a or 3.
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. Electrical contact resistance testing shall be as specified in the contract or order see 6. Chromate conversion coating chem film, also widely referred by the brand names alodine or iridite, is the application of a chromate conversion coating on aluminum alloys. Mildtl5541 chemical conversion coatings on aluminum and. Mil a8625 type ii, class 1 ams1471 astm b580 type b thru f 7. Chemical conversion coatings on aluminum plating per mil dtl 5541 and mil c 5541 conversion coatings for aluminum meets requirements of military specifications mil dtl 5541 specifications aluminum alloys and coatings benefit from additional protective features of conversion coatings. This film typically appears to be gold or brown in color, but in. Chromate conversion coating is a type of conversion coating used to passivate aluminum alloys. Milc5541 chem corrosion resistant coating aerobase. Electroless nickel plating is an process that codeposits a nickelphosphorous alloy without need for an externally applied electrical current. Chem processing offers both trivalent rohs compliant and hexavalent chromium based chem film. Mil c 5541f, chemical films, chromate iridite, aluminum chemical film coatings are gelatinous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of subsequent coatings such as paints and primers. Jan 28, 2008 mil c 5541 did not mention type i or ii whereas mil dtl 5541 link is to free spec at defense logistics agency, dla.
Mil dtl81706a 18 february 2002 superseding mil c 81706 30 june 1970 detail specification chemical conversion materials for coating aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. The best corrosion protection is provided by chem film permildtl 5541 class 1a. Even after 168 hours of salt spray testing, class 3 coatings must exhibit electrical resistance at no greater than 10,000 microhms per square inch. Trivalent chromate, mildtl5541, type ii, class 3, color clearcolorless. Mil c 26074c 3 my les5 military specification this specification ie approved for we by all departfmnta and agencie8 of the oapartmmt of defense. This specification covers chemical conversion coatings formed by the reaction.
Mil dtl 5541 f use or not use type i dear aerhead2, the major differences between the class 1a and 3 have to do with the electrical resitace properties of the coating. If you would like to participate, please visit the project page, where you can join the project and. Chem film per mildtl5541 class 3 is electrically conductive. We also offer the more traditional process for gold and yellow mil dtl5541f class 1a requirements. Workmanship, treatments and processes must meet specification guidelines.
Aluminum chromate conversion coating advanced plating. Chem film per mil dtl 5541 class 3 is electrically conductive. These twocomponent, manganese dioxide cured sealants are. Chromate leaves no measurable buildup, but provides excellent corrosion resistance. Provides maximum protection against corrosion, whether painted or unpainted. Difference between milc5541 class 1a and mildtl5541 type. Astm a153a153m standard specification for zinc coating hot dip on. Class 1a for maximum protection against corrosion, painted or unpainted. Mil dtl5541f 11 july 2006 superseding mil c 5541e 30 november 1990 detail specification chemical conversion coatings on aluminum and aluminum alloys this specification is approved for use by all departments and agencies of the department of defense. Electroless nickel plating per milc26074, astm b733, ams.
Chemical film chem film coatings are gelateneous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of. Milprf23377 class c2 over the waterreducible epoxy primer milprf85582 class c1. For mildtl5541, it is very clear when type ii is mentioned, the conversion coating shall not contain hexavalent chrome, hence, rohs compliant. Chemical conversion coating mildtl5541 aluminum coatings. Clear chromate rohs compliant mil c 5541 type i, class 1a mil dtl 5541 astm b449 ams 2473 mil std 171 finish no. Below is the most common specification for chromate conversion.
Military specification this specification ie approved for we. The current specification 2009 is mil dtl5541f, which superseded mil c 5541e in july 2006. Mil dtl 5541 type ii, class 1a and class 3 rohs compliant astm b921 class 1a and class 3 rohs compliant we are an approved supplier for. Please use the below content for reference only the chromate process provides a clear iridescent to slightly golden iridescent film of low contact resistance. Contact ens technology regarding chromate conversion coating mil dtl 5541 today. Electrolurgy performs chem film to mil dtl 5541 for aerospace and general industry in irvine, ca. Electrolurgy performs chem film to mildtl5541 for aerospace and general industry in irvine, ca. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys. A discussion started in 2004 but continuing through 2017. Class 1a chemical conversion coatings are intended to. Hexchrome free, rohs compliant, chemical conversion for aluminum. Polysulfide two component sealant ac350 class c 3m aerospace sealant ac350 class c polysulfide twocomponent sealant product description 3m aerospace sealant ac350 class c is a flowable, fast cure, medium density polysulfide sealant suitable for fuel tank and fuselage sealing and repairs.
I need to know when to use type i and not to use type i finish. This is created through the chemical conversion substance reaction with aluminum and its alloys. Milc5541 class 1a provides the heaviest coating, while class. Type i, class 1a, form i, method c oakite chromicoat l25 navairdevcen ltr 6062 ser 91638 dtd 15 jul 1970 0l040 m green until. The military specification referred to as mil dtl 5541, military specification, chemical conversion coatings on aluminum and aluminum alloys covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. Finish specifications cross reference this chart is an approximate reference only. Qpl number 81706 milc5541 document id mildtl81706b, type ii, class 1a, form i, method c. Chem film chromate conversion coatings electrolurgy. Fsc standardization area mffp metal finishes and finishing processes and procedures this document comes with our free notification service, good for the life of the document. As established by mil dtl 5541, both class 1a and class 3 refer to coatings that offer increased corrosion resistance and adhesive properties. We also offer the more traditional process for gold and yellow mildtl5541f class 1a requirements. Mil dtl81706 chemical conversion materials for coating aluminum and aluminum alloys. This specification covers chemical conversion coatings formed by the.
Electroless nickel plating is an process that codeposits a nickelphosphorous alloy without need for. Color can vary from colorless to golden iridescent brown. Precision finishing of aluminum products anodize chromate hardcoat passivate river street metal fini shing, inc. Chemical conversion coatings on aluminum plating per mildtl5541 and milc. Mil mildtl5541f chemical conversion coatings on aluminum and aluminum alloys superseding milc5541e standard by military specifications and standards, 07112006 amendments available.
The current specification 2009 is mildtl5541f, which superseded milc5541e in july 2006. Mildtl5541f chemical conversion coatings on aluminum and. Type ii, class 1a, for maximum protection against corrosion, painted. It is primarily used as a corrosion inhibitor, primer, decorative finish, or to retain electrical conductivity. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mil dtl5541f class 3. Aluminum chromate conversion coatings per mil c 5541 mil dtl 5541 and astm b44993 advanced plating technologies no longer offers chromate services. Mildtl5541 type ii, class 1a and class 3 rohs compliant astm b921 class 1a and class 3 rohs compliant we are an approved supplier for. This specification covers the requirements for two classes of. Mil c 5541 class 1a provides the heaviest coating, while class. Chromate conversion coating capabilities milc5541e. Although mil dtl 5541 has been superseded by more recent specifications, it still remains a specification approved by all agencies and departments in the us department of.
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