The technique for preparing metal sections can be divided into two groups, those processes involving the use of emery papers and coarse abrasives (grinding) and the subsequent operations using fine abrasives (polishing treatments).
Compression-type molding is commonly applied to encase specimens in 1 to 1.5 inch diameter plugs of a hardened polymer.
Microstructural examinations and visual evaluations of fracture surfaces provide an invaluable insight into the mechanism of component and assembly failures.
Typically, the metallography process uses sample specimens removed and mounted in bakelite plastic. The specimens are then ground to a fine finish with sandpaper and then polished to a mirror finish with diamond or alumina polishing materials.
In general titanium has excellent resistance against corrosion but this does not mean it is infallible and susceptibility still remains to a range of corrosive forces.
The main corrosion areas to be considered when dealing with titanium alloys are erosion corrosion, stress corrosion cracking, corrosion fatigue, and crevice corrosion.
Metallic coatings provide a layer that changes the surface properties of the work piece to those of the metal being applied. The work piece becomes a composite material exhibiting properties generally not achievable by either material if used alone.
Metallic coatings are deposited by electroplating, electroless plating, spraying, hot dipping, chemical vapor deposition and ion vapor deposition.