Synthetic Effects of Frequency and Duty Ratio on Growth Characteristics, Energy Consumption and Corrosion Properties of Microarc Oxidized Coating Formed on Ti6Al4V

Abstract

The synthetic effects of frequency and duty ratio on growth characteristics and corrosion properties of coating on Ti6Al4V fabricated by microarc oxidation are investigated comprehensively. Under the condition of uniform cumulating time of positive impulse width, the essence of altering frequency and duty ratio to determine the formation of coating is to vary the duration and interval time of positive pulse. The growth of coating is mainly controlled by duration time of positive pulse and hardly correlated to the interval time of positive pulse, while both duration and interval time of positive pulse have few influences on the morphology and phase structures of coating. The dynamic current is related to positive impulse width and the ratio of positive pulse on-time to pulse off-time. Regardless of uniform duration or interval time of positive pulse, the energy dissipation presents a descending tendency. The relationship between energy consumption and anticorrosion performance is contradictory, and obtaining excellent corrosion resistance is bound to sacrifice lots of energy. The duty ratio and frequency can be designed purposefully to realize the optimal process.

Corrosion Behaviors of Nitride Coatings on Titanium Alloy in NaCl-Induced Hot Corrosion

“…Titanium alloys are extensively applied in the aerospace, petrochemical, metallurgical, papermaking and medical industries due to their low density, high specific strength, favorable corrosion resistance and low costs [1][2][3][4]. When they operate under salt-containing service environments (such as boiler tubes in waste incinerators and engine components), chlorides-rich salt deposits inevitably condensate on the alloy materials.…”

Study of the Properties of Qxide Coatings Formed on Titanium by Plasma Electrolytic Oxidation Method

“…The oxide coatings obtained due to microplasma treatment in electrolyte solutions have high ad-hesion to the substrate [8,9], wear resistance [10][11][12], heat resistance [13], and corrosion resistance [14]. Oxide coatings are characterized by different porosities [15,16].…”