1. Impregnation

   Powder metallurgy components are inherently porous. Impregnation, also called penetration, involves filling most of the pores with: plastic, resin, copper, oil, another material. Putting a porous component under pressure can cause leaks, but if you impregnate the part, it will become pressure-tight. The material used to impregnate the part depends on factors such as cost and application. Oil immersion allows parts to automatically lubricate. Everything depends on your design needs.

2. Electroplating

   Plating is an alternative to stainless steel for aesthetic or functional needs - making the part more visually appealing and improving corrosion resistance etc. Plating gives you these qualities while allowing you to "sandwich" cheaper materials into the original part.

3. Shot peening

   Shot peening is a localized densification process that improves the surface of a part by removing burrs and applying surface compressive stress to the part. This may be beneficial in certain fatigue applications. Sandblasting also created small pockets that trap lubricant on the surface of the part. Fatigue cracks usually start due to surface defects. Shot peening can effectively prevent the formation of surface cracks and may delay the development of bulk cracks.

4. Steam treatment

   When applied to iron-based components, steam treatment creates a thin, tough oxide layer. The oxide layer doesn't rust; it's a substance that sticks to iron. This layer can improve: corrosion resistance, pressure resistance, hardness