1 Jun Q. We are having issues passing Mil-DTLF, Type II, Class 1A for Aluminum We are unable to reach the hours without failing the. Title: Chemical Conversion Coatings on Aluminum and Aluminum Alloys. Scope: This specification covers chemical conversion coatings formed by the reaction. Chemical Films are also known as chem film, alodine, iridite, chemical conversion coatings, or chromate conversion coatings. We offer Mil-Spec and RoHS.
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Corrosion prevention Military of the United States standards. This has led to progressively greater restrictions, imposed by national and international legislation, related to concerns over health and safety and environmental protection, on the use of these treatments.
As far mil-dhl-5541 I am concerned, there is no yellow conversion coat yellow chromate if you prefer that is Type II. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
MIL-DTLF – Alodine – Chemical Film – Chem film – MIL-C | Santa Clara Plating
If you have time check out http: 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. Views Read Edit View history.
When Type I is mentioned, the conversion coat contains Hexavalent Chrome but it may not necessarily be yellow. The customer is giving us a hard time. This page was last edited on 26 Septemberat Retrieved from ” https: I think the confusion is that there are RoHS compliant trivalent conversion coatings which are yellow through the addition of dye — but they are not compliant with MIL-DTL From Wikipedia, the free encyclopedia.
The situation is simply that parts processed in Type II solutions do not put hexavalent chromium on the parts, so the parts are very likely to be RoHS complaint. Languages Deutsch Edit links.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. 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.
There are clear conversion coatings out there which are Hexavalent chromium based. RoHS is short for the European Parliament’s directives on Reduction of Hazardous Substances, and refers to the constitution of the parts, not the processes used to manufacture the parts. Class 1A is the same for both standards.
We appended your question to thread where Cheah Sin Kooi had answered the question: They are used to repair anodized coatings on aluminum. Many domestic and non-European customers are requiring RoHS compliance, so it is understandable that the customer is giving you a hard time — he may not be able to use the parts.
The military specification referred to as MIL-DTL, “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. A former governor of NJ once remarked that ” ‘toxic’ is a matter of statute, not opinion”and I think we can look at the word ‘hazardous’ the same way.
Chemical Films (Alodine)
We have parts processed per type I versus required type II. It has gained world wide use across many fields versus the more verbose ISO equivalent i.
Mike, Further readings on earlier posts at finishing. The conversion coatings covered by this specification mil-dtl-55541 most commercially available products. Or just the chemical solution used in the process?
However, these treatments use hexavalent chromium chemicals that are extremely toxic. The MIL-DTL specification covers chemical conversion coatings that form protective coatings by chemical reaction with aluminum and aluminum alloy; these coatings are categorized by the following types and classes.
Although prepared specifically for DoD applications, the standard is used for many commercial applications as well. We appended your question to a thread which answers it.
The conversion coatings are intended for use on aluminum and aluminum alloy substrates that are not anodized. Is the part processed per type I hazardous in any way? Note that chromate conversion coatings have been used for over 50 years as treatment to coated or as-fabricated surfaces to boost corrosion resistance and provide a good basis for the subsequent application of paint.
December 9, A. This is a requirement due to their use on military aircraft. What is the difference between these two mil standards?
June 16, A.