Research on surface modification and property of architectural landscape steel structures
In order to improve the surface performance of architectural landscape steel structures, four different composition ratios of (Ni60+Al2O3) coatings were prepared on the Q345B steel substrate sur-face using plasma spraying and chemical modification methods. The effects of powder composition ra-tios on the phase composition, morphology, hardness, wear resistance, and corrosion resistance of the coatings were studied. The results showed that there were no abnormal pits or cracks on the surface of the four coatings, and there were partially melted particles and micropores in local areas; The surface roughness of the coating will decrease as the mass fraction of Ni60 powder increases, the bonding strength between coating A (10％ Ni60), coating B (20％ Ni60), coating C (30％ Ni60), and coating D (40％ Ni60) with the steel structure substrate is 26, 37, 50, and 56 MPa, respectively. The hardness of the coating area and interface area is higher than that of the steel structure substrate, and the coating area of coating C has the highest hardness; When the mass fraction of Ni60 powder increases from 10％ to 40％, the wear of the coating first decreases and then increases, and the wear rate of coating C is the smallest, with the best wear resistance. Chemical modification treatment can improve the corrosion re-sistance of the surface coating on Q345B steel substrate. When the mass fraction of Ni60 powder in-creases from 10％ to 40％, the corrosion potential of the chemically modified coating first shifts posi-tive and then negative, the corrosion current density first decreases and then increases, and the imped-ance arc radius first increases and then decreases. After chemical modification, the corrosion potential of coating C is the most positive, the corrosion current density is the smallest, and the impedance arc ra-dius is the largest, coating C has the best corrosion resistance performance.
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