The adhesive used tobond the aluminum foii form the cells of the core shal1 be of such quality that the resultant core will meet the requirements specified herein. Mildtl5541 requires coatings survive 1 week exposure per astm. 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. These coatings can modify the surface of the aluminum material for improved corrosion resistance, electrical. 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. Specification mildtl81706b qualifies products for use in. Milc81706 and been accepted for listing on the applicable qualified products. Milc5541, class 3 over qqp416, type ii, class 3 over.
Mil dtl81706 covers the requirements for the chemical materials used in the formation of conversion coatings by the reaction of the material and the surfaces of aluminum and aluminum alloys. Mildtl5541 is a military specification related to conversion coatings. Class 3 chemical conversion coatings are intended for use as a corrosion preventive film for electrical and electronic applications where lower resistant contacts, relative to class 1a coatings, and anodic coatings in accordance with mila8625, are required see 6. Milc5541 mildtl5541 show complete document history. Durability of corrosion protection coatings for aluminum osti. This specification covers chemical conversion coatings formed by the reaction. Surtec 650 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. 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.
Chemical conversion coatings on aluminum plating per mildtl5541 and mil c5541. Apr 02, 2009 chemical conversion coating mildtl5541 type 2, class 1a hexavalent free chrome. Mildtl5541 chemical conversion coatings on aluminum and aluminum alloys. Aluminum chromate conversion coatings to milc5541 mildtl5541 type i compositions containing hexavalent chromium type ii compositions containing no hexavalent chromium. Milc5541 did not mention type i or ii whereas mildtl5541 link is to free spec at defense logistics agency, dla. Iridite milc5541 mildtl5541 class 3 ams2474 astm b449 class 3 7. 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 3 chemical conversion coatings provide a corrosion preventive film for electrical and electronic applications where lower resistant contacts, relative to class 1a coatings, and anodic coatings in accordance with mila8625, are required. Mil dtl 5541 is a military specification related to conversion coatings. This is created through the chemical conversion substance reaction with aluminum and its alloys. For mil dtl 5541, it is very clear when type ii is mentioned, the conversion coating shall not contain hexavalent chrome, hence, rohs compliant. This specification is intended specifically to provide components of military weapon systems with maxim.
The current specification 2009 is mil dtl5541f, which superseded mil c 5541e in july 2006. Milc5541 link is to free spec at defense logistics agency, dla. This specification is approved for use by all departments. Mil c 5541 link is to free spec at defense logistics agency, dla. Mila8625f type iii class 2 black, blue, red mildtl5541f type i class 1a yellow only mildtl5541f type i class 3 yellow and clear mildtl5541f type ii class 1a clear only mildtl5541f type ii class 3 clear only astm b633. Method c immersion method d applicator pen or presaturated applicator device 1. A discussion started in 2004 but continuing through 2017. Pdf milc5541 mildtl5541 mila8625 milc26074 milf18240. Difference between milc5541 class 1a and mildtl5541 type. Iridite, alodine mil c 5541 class 3 mil dtl 5541 type i class 3 ams2474 astm b44993 class 3 7. For mildtl5541, it is very clear when type ii is mentioned, the conversion coating shall not contain hexavalent chrome, hence, rohs compliant.
Instructions for use the bottom of the can, has been fully incorporated into the base. The reworked area shall not exceed 12 inch in the longest dimension. Class 3 for protection against corrosion where low electrical resistance is required. We also offer the more traditional process for gold and yellow mildtl5541f class 1a requirements. Color can vary from colorless to golden iridescent brown. Stir or shake the base component to ensure any pigment, which may have settled on the base component longer than 5. 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. We offer an rohscompliant clear trivalent chromium process that is free from hexavalent chromium and complies with the requirements of mildtl5541f class 3. This specification does list the applicator pen as an option under methods of application. Mil c 26074c 3 my les5 military specification this specification ie approved for we by all departfmnta and agencie8 of the oapartmmt of defense. Welcome to, your premiere source for free downloads of government and military standards, specifications, handbooks, and documents. Nonhexavalent chemical conversion films on aluminum. 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. Mildtl5541 chemical conversion coatings on aluminum and.
Qualified under specification mildtl81706b, class 1a, form ii, method a, b, c. 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. It is most commonly yellowtogold for class 1a, depending upon the al alloy. An nsn, although displayed or written as a continuous string of digits, consists of two separate components the fsc and niin. Chemical conversion coatings on aluminum plating per mildtl5541 and milc5541. Milc5541 is currently under revision to allow for nonhexavalent coatings. Surpassing over 15,000 test panels it outperforms existing trivalent and hexavalent alternatives in wear and corrosion resistance without requiring additional topcoats while being more economical in cost per application. Chromate conversion coating capabilities milc5541e. Qpl approved chemistries for chromate conversion chemeon. Chem film type i class 1a milc 5541 mildtl5541 type i class 3 chem film, hexavalent chrome free type ii class 1a type ii class 3 rohs compliant magnesium dichromate treatment dow 1 type i ams m 3171 mil m3171. 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. This film typically appears to be gold or brown in color, but in. A spec or slash sheet identifies a specific piece or section of a general specification or standard.
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. Because class 3 coatings are thinner they are more susceptible to corrosion than class 1a. It shall be free from areas of powdery or loose coating, voids. Mildtl5541 chemical conversion coatings on aluminum. Class 1a chemical conversion coatings are intended to. Milc5541, class 1a, brush application milc81706, method b. This is a relatively thick coating used as a final finish or. Class 1a chemical conversion coatings are intended to provide corrosion prevention. The third document milc5541 specifies the performance characteristics of chemical conversion films on aluminum. Chemeon tcphf is environmentally safe and superior trivalent chromate alternative to hexavalent chromates. A national stock number nsn is a thirteen digit number uniquely identifying a single government part designation.
Color is not specified in milc5541e nor its material qualification spec. This document is available in either paper or pdf format. P41la86251 30 superseding mila8625c 15 january 1968. Iridite, alodine milc5541 class 3 mildtl5541 type i class 3 ams2474 astm b44993 class 3 7. The current specification 2009 is mildtl5541f, which superseded milc5541e in july 2006. Mildtl81706b 25 october 2004 superseding mildtl81706a 18 february 2002 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. The basis mtal ehall be free frem defects that will be detrismntel to the utility, appearance or serviceability of the finished pr. Mildtl81706 covers the requirements for the chemical materials used in the formation of conversion coatings by the reaction of the material and the surfaces of aluminum and aluminum alloys. The clear iridite 142 finish also qualifies under class 3, form ii, method c of the same specification.
Jan 28, 2008 milc5541 did not mention type i or ii whereas mildtl5541 link is to free spec at defense logistics agency, dla. Type i, ii yellow and black, iii, v rohs clear, sc1, sc2, sc3, sc4. Difference between milc5541 class 1a and mildtl5541. Aluminum surfaces shall be treated with materials conforming to milc5541 or equivalent. 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. Class 1a for maximum protection against corrosion, painted or unpainted class 3 for protection against corrosion where low electrical resistance is required. Provides maximum protection against corrosion, whether painted or unpainted.
Nsn a national stock number nsn is a thirteen digit number uniquely identifying a single government part designation. Aluminum chromate conversion coating advanced plating. For maximum conductivity where low electrical resistance is required. Chemical conversion coating mildtl5541 type 2, class 1a hexavalent free chrome. Class 1a for maximum protection against corrosion, painted or unpainted. This revision now allows for nonhexavalent chemicals. Milc5541 mildtl5541 type i yellow type ii clear ams2473 astm b449 7. To find similar documents by federal supply class code. The mil dtl 5541 specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy. An nsn, although displayed or written as a continuous. Iridite chromate conversion coating finish milc5541. Mildtl5541f chemical conversion coatings on aluminum and. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. Military specification this specification ie approved for we.
Milc5541, class i a, 3 mildtl5541 type i, ii class ia, 3 ams 2473. 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. The trivalent chromium process tcp provides a non hexavalent chrome coating compliant with rohs, elv and weee directives. 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. The chemical conversion coatings are of the following types.
The military specification referred to as mildtl5541, military specification, chemical. Sponsored links speed downloads mil c 5541 trusted download 1500 kbs 10 310 mil c 5541 highspeed download 1200 kbs 5 945 mil c 5541 full download kbs 1 290 68 p misc accy mila8625, type ii, class 2. Mil c 5541 did not mention type i or ii whereas mil dtl 5541 link is to free spec at defense logistics agency, dla. Type i compositions containing hexavalent chromium. Touchnprep alodine pen implementation at boeing st. Workmanship, treatments and processes must meet specification guidelines, bath chemistry. Qpl number 81706 milc5541 document id mildtl81706b, type ii, class 1a, form i, method c document id mildtl81706b, type ii, class 3, form i, method c. This is a relatively thick film used as a final finish or pretreatment to paint or powder coating, and it is typically gold, brown, or yellow depending on coating weight and alloy. Class 3 chemical conversion coatings provide a corrosion preventive film for electrical and electronic applications where lower resistant contacts, relative to class 1a coatings, and anodic coatings in accordance with mil a8625, are required. To my knowledge, it is an option only available for class 3 coatings, which have a lesser salt spray requirement than class 1a for qpl81706 listing. Pins to be used for the chemical conversion materials for coating aluminum and aluminum alloys acquired to this specification are created as follows. 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. Chemical conversion coatings on aluminum plating per mildtl5541 and milc5541 conversion coatings for aluminum meets requirements of military specifications mildtl5541 specifications aluminum alloys and coatings benefit from additional protective features of conversion coatings. The format and any coded meanings to the designation are identified and explained in the specification.
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