Considerations Regarding Sandblasting Metal Surfaces Designed for Electric Arc Spraying

Abstract

In order to ensure adherence of the arc sprayed layer, on the metal substrate, a few specific operations must be performed: initial cleaning, degreasing, roughening, final cleaning and degreasing. At the moment, there are standards which refer to the degree of preparation for processing metal surfaces by spraying. Performing metallic surface preparation operations require compliance with specific health and safety measures and environment protection.

Effect of spraying parameters on surface roughness, deposition efficiency, and microstructure of electric arc sprayed brass coating

“…The EAS coating usually depicts the inhomogeneous surface roughness profile that depends upon the spraying parameters (current, voltage, and spray distance). It is suggested that the threshold substrate roughness of about 3.5 μm is required for better metallic EAS deposition (Georgescu et al, 2015). As the process parameters during grit blasting were constant for all samples, the ASR values of all the samples after grit blasting were almost the same as presented in Table 3.…”

“…Microstructure, fatigue strength, wear rate, corrosion resistance, coating porosity, hardness, toughness, deposition efficiency (DE), adhesive strength, surface roughness (SR) and oxide contents are the most significant parameters which determine the characteristics of coatings (Kumar et al, 2016;Boronenkov and Korobov, 2016;Tillmann et al, 2008). Various parameters in thermal electric arc spraying technique which affect the quality of coating comprise the voltage, current, wire feed rate, spray off distance (SOD), nozzle geometry, (Li and Li, 2005;Wilden et al, 2005;Toma et al, 2013a;2013b;Matz and Aumiller, 2014) coating's surrounding environment (inert, ambient or vacuum chamber), pressure of atomized gas, feedstock material (Mauer et al, 2017), type of atomized gas (air or nitrogen), preheating of the substrate surface or post heat treatment of coating lamellae (Chen et al, 2010;Zhou et al, 2017) and type of surface preparation (shot blasting, sandblasting, rough threading) (Georgescu et al, 2015). The EAS coating technique produces the coating of high porosity, high oxide content, low DE, and high SR (Toma et al, 2015;Adamiak et al, 2018;Bonabi et al, 2018).…”

Technical, environmental, and economic feasibility investigation of an innovative dry washing process for metal degreasing

“…Moreover, they are highly volatile substances, and occupational exposure occurs through solvent vapour inhalation [3,4]. Since solvents are toxic to human health [5], metallic cleaning requires compliance with health and safety standards and environmental protection [6][7][8]. The growing awareness of the risks associated with chemicals drives organizations to carry out social responsibility initiatives and deploy considerable research efforts to face specific environmental problems [9][10][11].…”