Conversion Coating of Titanium Alloys
Question: What can you tell me about conversion coatings for titanium alloys?
Question:
What can you tell me about conversion coatings for titanium alloys? I recently spoke with an individual who works for an aerospace metal finishing company. He mentioned that the company performs a fluoride/phosphate type conversion process. What is it? S. A.
Answer:
Yes, there is a fluoride/phosphate type conversion coating for titanium alloys. It is typically used to prepare the titanium alloy surface for anti-galling and organic finishes. The typical conversion bath has the formulation illustrated in Table II.
Typically, the parts after cleaning are immersed in this bath for 2–4 minutes. The bath temperature should be maintained at 80°F (plus or minus 10).
Before you even consider using this process you must obtain a copy of the specification and verify that you are equipped to work with the chemicals listed in the formulation. Details for this procedure can be found in the AMS Specification 2486D which is available from SAE Aerospace, (877) 606-7323, www.sae.org.
Related Content
-
Liquid Chrome Vs. Chromic Acid Flake
Contemplating how to continue offering chromic acid services in an increasingly stringent regulatory world? Liquid chrome products may be the solution you’re looking for.
-
Troubleshooting Alkaline Zinc
One of the most common problems that can arise when plating with alkaline zinc is an imbalance of brightener in the solution. In this helpful Ask the Expert article, Chad Murphy of Columbia Chemical discusses how different zinc metal concentrations and brightener concentrations can impact efficiency.
-
How to Choose Between Sulfate and Chloride-Based Trivalent Chromium
There are several factors to consider when choosing between sulfate and chloride-based baths for trivalent chromium plating. Mark Schario of Columbia Chemical discusses the differences and what platers should keep in mind when evaluating options.
