Enhancement of Corrosion Resistance of NiCrFeBSi Coatings Obtained by Flame Thermal Spray Process Adding an Electroless Nickel Coating Ni-P

• 作者: Alba Covelo-Villar Ana María Bolarín-Miró Arturo Barba-Pingarrón Carlos Domínguez-Ríos Félix Sánchez-De Jesus Miguel ángel Hernández-Gallegos Rafael González-Parra Raúl Valdez-Navarro
• 来源期刊: 表面工程材料与先进技术期刊(英文)
• 学科: 工学
• 关键词: FLAME Thermal Spray COATINGS ELECTROLESS Nickel PLATING Duplex COATINGS Corrosion Resistance
• 年，卷（期）: 2017,（4）
• 页码范围: 86-97
• 页数: 12页
• 分类号: TG17

摘要

Flame Thermal Spray (FTS) coatings frequently show some porosity and reduced adherence to substrate, which affect its properties, especially its corrosion resistance. In this work, the corrosion resistance of AISI 1018 carbon steel coated by different methods is compared: electroless nickel (EN) coating, NiCrFeBSi obtained by FTS, duplex coatings of an EN deposit on a layer of NiCrFeBSi obtained by FTS and a layer of NiCrFeBSi on an EN deposit. The coatings were characterized using optical microscopy and scanning electron microscopy techniques, EDS microprobe microanalysis, roughness as well as electrochemical polarization tests to obtain the corrosion rate. The results show the enhancement in the corrosion resistance in saline medium of the duplex coatings, especially of the EN coating on FTS layer.