Abstract
Double glow plasma surface metallurgy (DGPSM) technology was applied to obtain a Fe-Al-Cr coating on the surface of Q235 carbon steel. The influence of the sample temperature, gas pressure, the distance between the substrate, and the source electrode on the quality of the obtained Fe-Al-Cr coatings was systematically investigated. The results showed that the parameters for DGPSM have a significant effect on the uniformity, particle size, compactness, and thickness of the coating. Under the optimized parameters (sample temperature: 800 °C, gas pressure: 35 Pa, and electrode distance: 15 mm), the obtained Fe-Al-Cr coating contains Fe2AlCr, Fe3Al(Cr), FeAl(Cr), Fe(Cr) solid solution, Cr23C6, and α-Fe(Al), exhibiting excellent corrosion resistance in a 0.5 mol/L H2SO4 solution, which is even better than that of the 304 stainless steel.
Highlights
Carbon steel can be widely used in the industrial manufacturing area, such as in boiler pipe, chemical reactor, and pressure vessel in the petroleum chemical industry, or the cabin of the ship in the marine vehicle industry [1,2,3]
To study the effect of the sample temperature on the obtained Fe-Al-Cr alloyed layer, the sample temperature was varied in the range of 750–900 ◦ C, while other parameters were set as follows: the voltage of source electrode (Vs = 850–950 V), the voltage of cathode (Vc = 450–550 V), the depositing time (t = 3.5 h), the gas pressure (P = 35 Pa), and the electrode distance (d = 15 mm)
25 μm was formed on the Q235 substrate, which can be divided into three layers, namely the outside deposited layer ofmetallurgy about 5.5 μm, the middle compound layer with the thickness around μm, of double glow plasma process
Summary
Carbon steel can be widely used in the industrial manufacturing area, such as in boiler pipe, chemical reactor, and pressure vessel in the petroleum chemical industry, or the cabin of the ship in the marine vehicle industry [1,2,3]. A deep understanding of the effects of these discharge phenomenon appears, which transfers the alloying elements from the source electrode to the parameters on the quality of the obtained Fe-Al-Cr coating is very important to control the substrate at the cathode, and it can activate the surface of the substrate to promote the diffusion mechanical and chemical properties of the coating. This kind of study is still lacking. Experiments dimensions of 15 mm × 15 mm × 3 mm, followed by being polished with 20 mesh brown corundum and ultrasonically cleaned in acetone before DGPSM
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