INFLUENCE OF THERMAL TREATMENT APPLIED TO COMPOSITE DEPOSITS ON PITTING CORROSION

Abstract

Corrosion is the phenomenon of degradation of metallic materials under the chemical or electrochemical action of the environment or of substances with which the materials interact. There are several types of corrosion, and significant deposition of NiP/SiC composites is pitting corrosion. The corrosion tests were performed by cyclical voltammetry. The cyclic voltammetry curves for composite deposits from electrolytes without different phosphorus acid concentrations and applied to thermal treatments of 190 ° C and 420 ° C show that they have similar behavior at localized corrosion, but the surface of the cyclic voltammetry curve is higher for thermally treated sample at 420 ° C (P0S404). Thermal degassing leads to increased corrosion resistance.

Keywords

• corrosion types
• protective composite layers
• pitting
• cyclic voltammetry curves