10 - Corrosion in additively manufactured cold spray metallic deposits

Abstract

Employing the cold spray (CS) technology has been expanded to the surface restoration and reclamation and also additive manufacturing (i.e., production of freestanding deposits from soft to hard materials), owing to the development of the CS technique in recent years (especially with the advent of HPCS: high-pressure cold spray systems). Mechanical properties of cold sprayed bulk materials (deposits) and their noticeable improvement (by using proper postcold spray treatments) have been extensively studied by many researchers (as discussed in chapter 4). On the other side, most academic publications on the cold spray technology consisting of books, review, and research articles mostly cover the corrosion behavior of cold sprayed coatings (for corrosion protection) in an aggressive electrolyte. However, the corrosion behavior and corrosion resistance modification of cold sprayed deposits (produced by CSAM: Cold Spray Additive Manufacturing) have not been widely studied and discussed. Hence, in this chapter, the current research activities on the corrosion resistance modification of some cold sprayed metallic deposits will be reviewed and discussed based on the processing–structure–property relationships in the CS deposits.