Abstract
Al-TiC-CeO2 composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements, friction and wear testing, and an electrochemical workstation. The results showed that an Al-Fe phase appears in the coatings under different applied laser powers and shows good metallurgical bonding with the matrix. The dilution rate of the coating first decreases and then increases with increasing laser power. The coating was transformed from massive and short rod-like structures into a fine granular structure, and the effect of fine grain strengthening is significant. The microhardness of the coatings first decreases and then increases with increasing laser power, and the maximum microhardness can reach 964.3 HV0.2. In addition, the residual stress of the coating surface was tensile stress, and crack size increases with increasing stress. When the laser power was 1.6 kW, the coating showed high corrosion resistance.
Highlights
S355 is a special steel commonly used for offshore platforms
This paper will focus on analyzing the effects of laser power on the Al-TiC-CeO2 composite coating microstructure and properties, which provides an experimental basis for the application of Al-TiC-CeO2 composite coatings on offshore platforms
The X-ray diffraction (XRD) patterns obtained from the coating surfaces are shown on Figure 2
Summary
S355 is a special steel commonly used for offshore platforms. Because of the harsh environment, the underwater structure must be resistant to corrosion by sea water and marine life, endure long periods of service, and exhibit high strength and resistance to wear, corrosion, cracking, and other issues. Long-term corrosion protection of offshore platforms generally takes the form of improved surface coating technology, but maintenance is very difficult and expensive. High-power laser cladding can induce an Al-Fe compound reaction at the coating interface, resulting in the formation of metallurgical bonding to improve the coating resistance to corrosion from sea water [14,15]. There has been much research on laser cladding Al-based composite coatings at home and abroad, currently, the application of laser cladding technology to the preparation of high-performance Al-TiC-CeO2 composite coatings on offshore steel surfaces is rare. This paper reports on the use of laser cladding technology to prepare high-performance Al-TiC-CeO2 composite coatings on S355 offshore steel and studies of the resulting surface morphologies, chemical element distributions, and phase compositions of. This paper will focus on analyzing the effects of laser power on the Al-TiC-CeO2 composite coating microstructure and properties, which provides an experimental basis for the application of Al-TiC-CeO2 composite coatings on offshore platforms
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