Therefore, it is still necessary to prepare lignin with some degree of controlled modification. In recent decades, many lignin modification methods such as demethylation [12–14], methylolation [15,16], and phenolation [17,18] have been explored to increase the reactivity of lignin. Among ...
When the temperature of the molten metal was 690 ◦C, the boron steel was hot-dipped in the molten metal for 120 s to prepare the coating. Before coating, the specimens were preheated at 150 ◦C for 15 s to remove the water on the surface and to improve the wettability of the ...