Experimental Study on the Electrochemical Anti-Corrosion Properties of Steel Structures Applying the Arc Thermal Metal Spraying Method

Abstract

The arc thermal metal spraying method (ATMSM) provides proven long-term protective coating systems using zinc, aluminum and their alloys for steel work in a marine environment. This paper focuses on studying experimentally the anti-corrosion criteria of ATMSM on steel specimens. The effects of the types of spraying metal and the presence or absence of sealing treatment from the thermal spraying of film on the anti-corrosion performance of TMSM were quantitatively evaluated by electrochemical techniques. The results showed that ATMSM represented a sufficient corrosion resistance with the driving force based on the potential difference of more than approximately 0.60 V between the thermal spraying layer and the base substrate steel. Furthermore, it was found that the sealing treatment of specimens had suppressed the dissolution of metals, increased the corrosion potential, decreased the corrosion current density and increased the polarization resistance. Metal alloy Al–Mg (95%:5%) by mass with epoxy sealing coating led to the most successful anti-corrosion performance in these electrochemical experiments.

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

“…Hence, HCl seems to play some minor protective role to mild steel while in aluminium, it catalyses corrosion. This explains why the rate of corrosion of aluminium in HCl is higher than the rate of corrosion of mild steel in similar medium [16]. Hence, NBA is a better inhibitor for mild steel in solution of HCl than for aluminium because chloride ion resulting from ionization of HCl partly complements its inhibition action.…”

Deposition of Coating to Protect Waste Water Reservoir in Acidic Solution by Arc Thermal Spray Process

“…e coatings were applied to the substrate by the arc thermal spray gun (LD/U3 electric arc wire spray gun, Oerlikon MetcoTM, Switzerland) process using 304 SS and Ti wires with a circular slit of hot and compressed air [17][18][19][20]. e melted metal particles diffused onto the substrate and cooled at room temperature, resulting in the formation of pores/defects on the coating.…”

“…High corrosion-resistant materials such as SS, nickel (Ni), tungsten (W), molybdenum (Mo), chromium (Cr), and Ti need a specific deposition process. e arc thermal spray process is suitable and feasible for depositing these metals onto any substrate [12][13][14][15][16][17].…”

Corrosion Resistance Properties of Aluminum Coating Applied by Arc Thermal Metal Spray in SAE J2334 Solution with Exposure Periods

“…The top surface and cross section morphology of the coating by the SEM are shown in Figure 3. This coating had many defects as shown by the arrow marks (Figure 3a,b), which is a well-known feature for such coatings [6,8]. The melted metal particles continuously impinged on the base metals and formed layer upon layer of plate-like microstructures [26].…”