Failure Analysis of Titanium Spray in Service with Sodium Hydroxide

Antonio Pousa Neto, Donizeti Pires Fernandes, Yago Reitz de Castro, Patrícia Pala Diniz, Willy Ank de Morais

Abstract


This paper analyzes the premature failure of a spray titanium, occurred with only two years of operation, caused due corrosion by erosion. Erosion was generated by glass particles in the circulating fluid column of the equip-ment. The glass was inserted in the fluid through the wear of the walls of the vessel which is GFRP (glass fiber rein-forced plastic). The presence of glass particles and the high speed spray caused cavitation, which ended up slicing the spiral spray. The research addressed the methodology of failure analysis, and analysis tools as were used: chemical analysis, metallographic, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), and test process.

Keywords: Passivation; titanium; erosion; critical velocity; Failure Analysis.


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