High Carbon Steel Surface Treatment

Adhesion of what?

Alternatives to shot blasting include

Acid pickling is a possibility, Conversion coatings such as phos coatings.Give more specifics to get more focused answer.

Milo

Many thanks for your advice.

Refurbishment from mechanical wear of locomotive and rolling stock parts means great economical expenditure for any railway company. High polymeric composite coating with wear rate as low as one seventh of that of the Babbitt wear-proof alloy generally used in railway wagons and coefficient of friction as low as one tenth of that of iron to steel working couples is helping me to reduce the loss considerably. High precision without accurate machining or hand fitting is another advantage of composite coating.But, in case of high carbon steel parts, the results are not so satisfactory due to adhesion failure. That's the reason why I am looking for a better way for surface treatment. I am afraid nitriding is too costly in this case. I don't know if phos-coating may solve the problem. Could you give me any detailed information?

Get with your local heat treat house and ask them about ion nitriding. It not only opens micropores on the surface that are great for paint adhesion but it also adds a nitrogen layer that can resist corrosion for very long periods of time. There are many other advantages and some small disadvantages such as heat being applied that could cause some warpage but it is only a 900 degree process wich will not cause alot of movement if the parts are not highly stressed. This process also adds a .001" thick layer that can be as hard as a 65 rockwell. This could cause trouble if you need to machine the parts after the process but should not cause any problems otherwise.

www.woodworthheattreating.com

contact Robert Woodworth or Pat Fox for more insight into this process