Abstract
Underwater wet laser cladding (UWLC) has gradually become a hotspot in the research on online repair technology. In this study, by adjusting the ratio of CaF2 and TiO2 in an assistive agent, CaTiO3 slag was formed at a ratio of 1:1 and uniformly covered the top of cladding layers. The slag isolated molten pools from the influence of water and reduced the generation of porosity and cracks. A cladding layer with good macro forming and ideal performance was successfully prepared. Among all samples, a cladding layer with a 1:1 ratio for the assistive agent comprised the smallest grain size under complete coverage protection of the liquid slag. Moreover, it exhibited the highest hardness and consequently the lowest wear rate, wear volume loss, and excellent friction resistance; it also had the best corrosion resistance. The cladding layer with a 1:1 ratio for the assistive agent had a self-corrosion current density of 0.9201 × 10−7 A cm−2, which is the lowest among the samples, indicating that it had the lowest corrosion rate. Furthermore, it had the highest corrosion potential of −0.196 V, implying that corrosion is least likely to occur. This research elucidates the protective mechanism of the ratio of CaF2 and TiO2 components in assistive agents on the macro formability of UWLC layers. It holds considerable reference value for designing protective methods for cladding layer molding in aqueous environments.
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