<p>The wetting and corrosion behavior of chromium-containing high-alumina primary slag against coke were examined using sessile drop tests combined with static crucible experiments. The wetting process was monitored in situ via a high-speed camera. The results revealed that the contact angle on the coke substrate progressively increased with temperature upon the initial softening of the sample. Both higher basicity and Cr₂O₃ content led to elevated softening and melting temperatures, while concurrently resulting in a reduction of the final contact angle. The Cr₂O₃ content had a greater effect than basicity on the initial softening and melting temperatures. In contrast, basicity had a more pronounced influence on the temperature difference between softening and melting. At the final experimental temperature, strong interfacial interaction between the slag and coke substrate was maintained, as evidenced by contact angles consistently exceeding 120°. Compared to the liquid ratio of the primary slag at 1500°C, increases in both basicity and Cr₂O₃ content reduce the liquid ratio and diminish slag fluidity. Notably, higher Cr₂O₃ content effectively restrains the rapid growth of the liquid ratio, which contributes to improved permeability of the cohesive zone in blast furnace operation.</p>