MIL-DTL-5541 EBOOK

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MIL-DTLF. 11 July SUPERSEDING. MIL-CE. 30 November DETAIL SPECIFICATION. CHEMICAL CONVERSION COATINGS. standard by Military Specifications and Standards, 07/11/ View all product details Printed Edition + PDF; Immediate download; $; Add to Cart. MIL-DTL CHEMICAL CONVERSION COATINGS ON ALUMINUM AND ALUMINUM ALLOYS. PDF + Print. In Stock. Need it fast? Ask for rush delivery.


Mil-dtl-5541 Ebook

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View all details. Superseded By: MIL-DTL EN. Additional Comments: RENUMBERED AS MIL-DTLF. Format. Details. Price (USD). PDF. Single User. Mil Dtl f. Enviado por scotthawkins Direitos autorais: Attribution Non- Commercial (BY-NC). Baixe no formato PDF, TXT ou leia online no Scribd. MIL MIL-DTLF: CHEMICAL CONVERSION COATINGS ON ALUMINUM AND ALUMINUM ALLOYS(SUPERSEDING MIL-CE) [MIL] on taufeedenzanid.tk

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The dry unheated air for type I shall be not warmer than F 38 C and for type II shall follow the manufacturers recommended temperature ranges. Two test specimens prepared in accordance with 4. NOTES This section contains information of a general or explanatory nature that may be helpful, but is not mandatory. The conversion coatings covered by this specification are intended for use, throughout the Department of Defense, on aluminum and aluminum alloy substrates that are not anodized.

They are used to repair anodized coatings on aluminum. They are designated as a post treatment to ion-vapor deposition IVD aluminum used on many military platforms as a cadmium alternative or galvanic corrosion inhibitor. Type I and II conversion coatings provide corrosion protection on unpainted items, as well as improve adhesion of paint finish systems on aluminum and aluminum alloys.

The conversion coatings covered by this specification exceed commercially available products due to the nature of their use on aircraft. Class 1A chemical conversion coatings are intended to provide corrosion prevention on unpainted items as well as improve adhesion of paint finish systems on aluminum and aluminum alloys.

Coatings of this type may be used, for example, on tanks, tubing, and component structures where paint finishes are not required for interior surfaces but are required for the exterior surfaces.

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 MIL-A, are required see 6.

Coating thickness is varied by immersion time, and as a result, the same conversion material can be listed on QPL for both classes.

Because class 3 coatings are thinner they are more susceptible to corrosion than class 1A coatings. If it is required to paint areas surrounding electrical contacts, class 3 coatings improve adhesion of paint systems on aluminum and aluminum alloys. When under a nominal electrode pressure of psi, class 3 coatings are qualified under MIL-DTL to have a resistance not greater than 5, microhms per square inch as supplied and 10, microhms per square inch after hours of salt spray exposure.

In addition to the coating or coating thickness see 6. The following two variables see 6. Test specimens having rough surfaces will yield lower resistance values when subjected to a contact electrode pressure due to coating fracture.

Product details

This reasoning can also be applied to the contact electrode. If an electrode with a given surface area is not flat, the actual contact area will be lower than the theoretical value.

The same reasoning can be applied to the test specimen. Unless otherwise specified in the contract or order, the contractor is responsible for the performance of all inspection requirements examinations and tests as specified herein. Except as otherwise specified in the contract or order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government.

The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. All items must meet the requirements of section 3. The inspection set forth in this specification must become a part of the contractors overall inspection system or quality program. The absence of any inspection requirement in the specification will not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract.

Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material.

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Acquisition documents should specify the following: a. Title, number, and date of the specification. Type and class required see 1. Method of application, if restricted see 3. If touch-up is permitted for mechanically damaged areas see 3. Colorless coatings, if required see 3.

If touch-up is permitted for contact marks see 3. If electrical resistance testing if required for class 3 coatings see 3. When electrical resistance testing is required, specify the required resistance values, frequency of testing, and test method see 3.

Alloy and temper of the process control test specimens, if different than that specified in 4.

Paint finish system for treated parts, if applicable see 4. Quantity required. Sampling plan, if different than that specified see 4. Lot size, if different than that specified see 4.

These coatings are equivalent insofar as performance of the chemical conversion coating is concerned, to the provisions of this specification, but are not interchangeable from a chemical standpoint; that is, different materials cannot be mixed. As the chemical coating materials are proprietary products, the ingredients, processes, the method of application e. Contractors and military activities must take this into account in acquisition, in the design of parts, and in the establishment of facilities.

Detail drawing of parts requiring treatment in accordance with this specification should specify class 1A or 3, where applicable the required type, I or II, and any paint finishing systems required to meet the performance desired. If the coating class is not specified, class 1A is recommended. Use of a non-etch cleaner is preferred, particularly on wrought alloys.

MIL-DTL-5541F Datasheet (data sheet) PDF

If an etch is used, caution must be taken to prevent pitting or intergranular attack. This is particularly important when using an alkaline etch because the aluminum tends to be more soluble than its alloying elements and existing intermetallics, such as copper, which may be further exposed.

As a result, alkaline etching should be avoided particularly when cleaning assembled structures. If an alkaline etch is used, it should always be followed by an acid neutralization step.

The abrasion resistance of chemical coatings is relatively low. Coatings are reasonably durable when subjected only to moderate handling, but are readily removed by severe wear or erosion.

The chemical conversion coatings covered by this specification shall be produced by treatments and processes that produce coated components as specified in this specification.

The inspection requirements specified herein are classified as follows: a. Process control inspection see 4. Conformance inspection see 4. Test specimens shall be tested in accordance with table I and 4. In addition to the tests in table I, solution analysis shall be performed on all the processing solutions in the chemical conversion line see 3. Process control tests are conducted to determine compliance of the chemical conversion coatings with the requirements of this specification and are acceptable as evidence of the properties being obtained with the equipment and procedures employed.

Process control tests. Tests Class Number of test specimens 5 5 2 2 5 Test specimen preparation paragraph 4. Test specimens used for process control testing shall be 3 inches wide, 10 inches long, with a nominal thickness of not less than 0. The test specimens shall be processed with the hardware during an actual production run, including all pre- and post-treatment processes such as cleaning and rinsing, except as specified below.

Unless otherwise specified in the contract or order see 6. Aluminum alloy T3 test specimens may be used in lieu of T6 test specimens for testing class 3 coatings see 6. When castings are being processed and the cleaning procedures used are detrimental to the wrought test specimens, the test specimens shall be cleaned in a proper manner see 3. If the production parts are not T3 aluminum alloy and the etch or deoxidizer may be detrimental to the test specimens, the manufacturers recommended cleaning practices shall be used.

Unless otherwise specified on the contract or order see 6. In either case, the primer shall be applied to a dry film thickness of 0.

Failure to conform to any of the process control requirements specified in table I shall result in immediate cessation of production. The reason for failure shall be determined and corrected before production resumes. Solution analysis shall at a minimum be performed once every week see 6. The process control tests specified in table I shall at a minimum be conducted on a monthly basis.

In addition, the interval between each monthly test shall not exceed 35 days. If production in accordance with this specification is not performed for 35 days or more, process control tests and solution analysis shall be conducted at the restart of production. Unless otherwise specified, parts that have been painted or incorporated into an assembly shall not be considered retrievable.

Samples for visual examinations shall be selected from each lot see 4. Samples selected in accordance with 4. Each lot shall be inspected to ensure that the lot consists of all conversion coated items of the same type, class, form, and method, treated under the same process conditions, and submitted for acceptance at one time. Unless otherwise specified on the contract or order, the lot size shall not exceed the number of parts, articles, items, or components resulting from one days production see 6.

Failure to conform to 4. Test methods. Five test specimens prepared in accordance with 4. After the coating application, the test specimens shall be dried at 60 to F 16 to 38 C for 24 hours see 6. The test specimens shall then be subjected to a 5 percent salt spray test in accordance with ASTM-B for hours, except that the significant surface shall be inclined 6 2 degrees from the vertical. After exposure, test pieces shall be cleaned in running water not warmer than F 38 C , blown with clean, dry unheated air, and visually examined for conformance to 3.

The dry unheated air for type I shall be not warmer than F 38 C and for type II shall follow the manufacturers recommended temperature ranges. Two test specimens prepared in accordance with 4. NOTES This section contains information of a general or explanatory nature that may be helpful, but is not mandatory. The conversion coatings covered by this specification are intended for use, throughout the Department of Defense, on aluminum and aluminum alloy substrates that are not anodized.

They are used to repair anodized coatings on aluminum. They are designated as a post treatment to ion-vapor deposition IVD aluminum used on many military platforms as a cadmium alternative or galvanic corrosion inhibitor. Type I and II conversion coatings provide corrosion protection on unpainted items, as well as improve adhesion of paint finish systems on aluminum and aluminum alloys. The conversion coatings covered by this specification exceed commercially available products due to the nature of their use on aircraft.

Class 1A chemical conversion coatings are intended to provide corrosion prevention on unpainted items as well as improve adhesion of paint finish systems on aluminum and aluminum alloys. Coatings of this type may be used, for example, on tanks, tubing, and component structures where paint finishes are not required for interior surfaces but are required for the exterior surfaces. 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 MIL-A, are required see 6.

Coating thickness is varied by immersion time, and as a result, the same conversion material can be listed on QPL for both classes. Because class 3 coatings are thinner they are more susceptible to corrosion than class 1A coatings. If it is required to paint areas surrounding electrical contacts, class 3 coatings improve adhesion of paint systems on aluminum and aluminum alloys. When under a nominal electrode pressure of psi, class 3 coatings are qualified under MIL-DTL to have a resistance not greater than 5, microhms per square inch as supplied and 10, microhms per square inch after hours of salt spray exposure.

In addition to the coating or coating thickness see 6. The following two variables see 6. Test specimens having rough surfaces will yield lower resistance values when subjected to a contact electrode pressure due to coating fracture.

This reasoning can also be applied to the contact electrode. If an electrode with a given surface area is not flat, the actual contact area will be lower than the theoretical value.Acquisition documents should specify the following: a. This reasoning can also be applied to the contact electrode. Treated parts that have become soiled shall be cleaned with materials that will remove the soil without damaging the base metal, the part, or the conversion coating.

Mil Dtl 5541f

When electrical resistance testing is required, specify the required resistance values, frequency of testing, and test method see 3. By making everything available free of charge it lets us concentrate on content. If the area exceeds 5 percent, specific approval must be obtained from the acquisition activity before the area can be touched up.

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