The concept of the corrosion rate of titanium rods is basically only applicable to full-scale corrosion or general corrosion. For passive metal titanium, corrosion damage, especially equipment damage, cannot usually be at the corrosion rate, that is, corrosion weight loss per unit area or corrosion per unit area Depth to characterize and judge. Because the corrosion of titanium basically occurs in the form of local corrosion damage, the corrosion data in the table has only a reference significance at best for the selection of materials. The local corrosion of titanium proposed under the title of “Special Corrosion Forms” is not unique to titanium, but at least it can be said that titanium is particularly prominent. Therefore, on the basis of understanding the overall corrosion of titanium rods, we continue to discuss the local corrosion of titanium. This is not only a supplement to the content of the content, but also an indispensable and inseparable component of the corrosion performance of titanium. It is of special importance for the selection of titanium. The local corrosion of titanium rods is particularly prominent in five categories: combustion and ignition, hydrogen absorption and hydrogen embrittlement, pitting corrosion, crevice corrosion and welding corrosion, among which combustion and ignition and hydrogen absorption and hydrogen embrittlement are particularly serious forms of corrosion damage.