In order to study the effect of highly oxidizing dephosphorizing converter slag on the migration behaviour of phosphorus in molten steel, an industrial test was carried out on a 300t dephosphorizing converter in a steel plant by the duplex method. Theoretical analysis shows that when the temperature is low, the basicity is 1.5 and the FeO content is 25%-30%, the phosphorus capacity of slag is stable. The industrial test results show that when the temperature is 1630K-1665K, the basicity is 1.05-1.25, the FeO content is 35%-40%, and the dephosphorization efficiency of the converter can generally reach above 60%. XRD and SEM-EDS analysis results showed that phosphorus was mainly enriched in 2CaO•SiO 2 -3CaO•P 2 O 5 solid solution. Infrared analysis results show that under the condition of high FeO and low basicity, properly increasing of basicity is beneficial to reduce the degree of polymerization of dephosphorization slag.

The superhydrophobic coatings with excellent performance are prepared on the brass substrate to improve its application limitations in real production. In this article, the superhydrophobicity was obtained by the modification of TiO2 nanoparticles, and the FAS/STA-TiO2 superhydrophobic coating of the composite structure was obtained by modification of 1, 1, 2H, 2H-perfluoroquine trimethyl silane (FAS). By using scanning electron microscopes (SEMs), X-ray spectrometers (EDSs), and Fourier transform infrared (FTIR) spectrometers, the surface morphology, chemical composition, and functional group structure of the samples were analyzed in turn. Experiments show that the water contact angle of the FAS-modified STA-TiO2 coating reaches 161.3°, and the sliding angle is close to 1.2°. Based on the chalk dust containment, it has enabled noticeable self-cleaning properties. The composite superhydrophobic coating also presents enhanced adhesive strength compared with the single coating by the tape peeling experiment. Moreover, the composite coating has a corrosion current density as low as 8.41 × 10-7 A/cm2, and the largest |Z| in low frequency in a 3.5% NaCl solution to achieve better protection of the brass substrate. It is also not difficult to see that FAS/STA-TiO2 coating can not only improve the corrosion resistance of brass substrates but also be applied to other metal substrates.

In this work, the carbon steel matrix obtained a silane coupling agent (KH550) modified rough SiO2 coating, covering it by dip‐coating method. The modified SiO2 (K‐SiO2) coating on the carbon steel was coated with stearic acid (STA) and adjusted the proportion of SiO2 nanoparticles and KH550 to achieve the more perfect superhydrophobic sample. It turns out that SiO2 particles were evenly disturbuted and linked together by KH550 to form a stable structure. The K‐SiO2 coating liquid was further added a modifier of STA to achieve low surface energy, and then developed a durable and corrosion resistant coating. The superhydrophobic coating liquid was coated on the carbon steel to obtain a multifunctional superhydrophobic coating (contact angle=163°, rolling angle=1.4°), having excellent self‐cleaning, adhension, durability and corrosion resistance.