Microstructural and Corrosion Behavior of High Velocity Arc Sprayed FeCrAl/Al Composite Coating on Q235 Steel Substrate

Ndiithi, Ndumia Joseph; Kang, Min; Zhu, Jiping; Lin, Junjie; Nyambura, Samuel Mbugua; Liu, Yuntong; Huang, Fang

doi:10.3390/coatings9090542

Cited by 11 publications

(11 citation statements)

References 35 publications

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“…Ye et al [66] used a Cr 2 O 3 -Cr duplex interlayer, in which Cr 2 O 3 layer was an effective barrier to hinder the graphite formation, and the top Cr layer was carburized to Cr 3 C 2 and Cr 7 C 3 to enhance the interfacial adhesion. It is worthwhile to note that in some jobs about high temperature corrosion resistance, Fe-Cr-Al has been used to coat steel substrates and increase their corrosion resistance [67,68]. This may be also a promising interlayer for CVD diamond films on steel substrates.…”

Section: Methods Similar To Hot Corrosion Resistance Such As Aluminimentioning

confidence: 99%

Diamond Deposition on Iron and Steel Substrates: A Review

et al. 2020

Micromachines

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This article presents an overview of the research in chemical vapor deposition (CVD) diamond films on steel substrates. Since the steels are the most commonly used and cost-effective structural materials in modern industry, CVD coating diamond films on steel substrates are extremely important, combining the unique surface properties of diamond with the superior toughness and strength of the core steel substrates, and will open up many new applications in the industry. However, CVD diamond deposition on steel substrates continues to be a persistent problem. We go through the most relevant results of the last two and a half decades, including recent advances in our group. This review discusses the essential reason of the thick catalytic graphite interlayer formed on steel substrates before diamond deposition. The high carbon diffusion in iron would induce severe internal carburization, and then voluminous graphite precipitated from the substrate. In order to hinder the catalytic graphite formation, various methods have been applied for the adherent diamond film deposition, such as pre-imposed various interlayers or multi-interlayers, special controls of the deposition process, the approaches of substrate alloying and so on. We found that adherent diamond films can be directly deposited on Al alloying steel substrates, and then the role of Al alloying element was examined. That is a thin dense amorphous alumina sublayer in situ formed on the alloying substrate, which played a critical role in preventing the formation of graphite phase and consequently enhancing diamond growth and adhesion. The mechanism of Al alloying suggests that the way used to improve hot corrosion resistance is also applicable. Then, some of the hot corrosion resistance methods, such as aluminizing, siliconizing, and so on, which have been used by some researchers examining CVD diamond films on steel substrates, are reviewed. Another way is to prepare diamond-like carbon (DLC) films on steel substrates at low temperature, and then the precipitated graphite from the internal carburization can be effectively avoided. In addition, based on some new findings, the understanding of the diamond nucleation and metastable growth is discussed.

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Section: Methods Similar To Hot Corrosion Resistance Such As Aluminimentioning

confidence: 99%

Diamond Deposition on Iron and Steel Substrates: A Review

et al. 2020

Micromachines

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“…The obtained polarization curve was fitted with a Tafel curve to obtain the corrosion voltage and corrosion current, as shown in Table 3. The corrosion potential characterizes the thermodynamic stability of the samples under electrochemical corrosion conditions, while the corrosion current reflects the corrosion rate and the breakdown potential is the lowest potential for pitting corrosion [24]. It can be seen from Figure 14a that the polarization curves of the laser cleaning process with different powers all showed a positive movement compared to that of the matrix.…”

Section: Corrosion Resistancementioning

confidence: 99%

Investigation of the Surface Integrity of Q345 Steel After Nd:YAG Laser Cleaning of Oxidized Mining Parts

Wang

et al. 2020

Coatings

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As a common mechanical material for mining machinery, Q345 is prone to oxidation due to the moist working environment. At present, laser cleaning is often used to remove rust oxides from the substrate. The pollutant of mining machinery is comprised of a heavy oxide layer and organic ingredients, which are difficult to remove and require high energy per pulse. However, excessive energy is capable of easily destroying surface integrity, such as increasing surface roughness (Ra), generating ablative pits, oxidizing, decreasing microhardness (HV), and decreasing corrosion resistance. Therefore, this paper focused on investigating the surface integrity of mining parts under different laser powers, repetition rates and overlapping rates of the laser spots. The results showed that the surface integrity of the samples gradually improved as the energy per pulse and overlapping rates increased. However, excessive energy caused a negative effect on surface integrity. Based on the comprehensive analysis, optimal parameters were obtained when the power was 280 W, the repetition rate was 10 kHz (pulse duration 84 ns), and the overlapping rate of the laser spot was 70%. This work can provide theoretical guidance for the laser cleaning of mining machinery.

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“…Ndiithi et al used high-speed arc spraying method to prepare FeCrAl/Al composite coating on Q235 steel substrate with FeCrAl wire as anode and aluminum wire as cathode. The composite coating had better corrosion resistance than traditional FeCrAl coating [8]. Yang et al used alloy wire thermal spraying technology to prepare AlZnSi coating with lamellar structure on the surface of Q235 steel plate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Contents of WC on Microstructure and Properties of NiCrMo Coatings Prepared by PTA

et al. 2022

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During the service process of the mechanized fishing boat, its low carbon steel hull and parts are extremely susceptible to Cl− erosion and seawater scouring, which cause a decrease in strength and lead to failure. To increase its service life and reduce maintenance costs, coating protection technology is widely used. In order to solve the problem of poor adhesion between paint coating and substrate and low strength of metal coating, NiCrMo-WC coatings with different WC contents (0 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) were prepared on the surface of Q235 substrate by plasma cladding technology. The coatings were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy spectrum analysis (EDS), etc. Its phase formation rule, microstructure and element distribution were studied. Microhardness test and electrochemical corrosion test were carried out. The study found that the 20 WC coating has the highest average hardness (563.1 HV). It is about 3.25 times of the Q235 substrate. It has the lowest friction, wear rate and lower friction coefficient, showing the best wear resistance. The 15 WC coating has the lowest self-corrosion current density (3.4934 × 10−7 A/cm2) and the lowest corrosion rate (0.0041 mm/a), which is only 3.7% of the corrosion rate of Q235 steel.

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Microstructural and Corrosion Behavior of High Velocity Arc Sprayed FeCrAl/Al Composite Coating on Q235 Steel Substrate

Cited by 11 publications

References 35 publications

Diamond Deposition on Iron and Steel Substrates: A Review

Diamond Deposition on Iron and Steel Substrates: A Review

Investigation of the Surface Integrity of Q345 Steel After Nd:YAG Laser Cleaning of Oxidized Mining Parts

Effect of Different Contents of WC on Microstructure and Properties of NiCrMo Coatings Prepared by PTA

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