The EQ70 high-strength low-alloy steel plate was treated using ultrasonic impact treatment (UIT) with titanium alloy (Ti6Al4V) pins. Scanning electron microscopy with energy dispersive X-ray microanalysis and X-ray photoelectron spectroscopy were employed to study the structure, morphology, surface chemical state, and composition of the treated product on the surface of the EQ70 steel. The microhardness was measured on the surface and the cross-section of the specimens. And the electrochemical corrosion test in the 3.5 wt% NaCl medium was carried out to evaluate the corrosion resistance of the UIT-treated specimens with different impact intensities and that without UIT. It is found that the UIT with Ti6Al4V pins can result in a mixed oxide cladding layer on the surface of the steel plate, the thickness of which increased with the impact intensity (treatment time). The elements in the cladding layer mainly come from the impact pin (Ti, Al, V), base metal (Fe), and the atmosphere (O), and the contents of these elements do not change significantly with the impact intensity. TiO, TiO₂, FeO and Fe₂O₃ are found to be the main oxides in the cladding layer. The mutual effect of the material transfer between the pin and the treated base metal is found. The surface hardness of the cladding layer increases with the impact intensity, reaching an almost constant value (approximately twice the hardness of the parent material) when the impact intensity is over 1.33 s/mm². The cladding layer can improve the corrosion-resistant properties of the EQ70 steel and get the best corrosion-resistant properties with an impact intensity ranging from 1.00 to 1.33 s/mm². The possible formation procedure of the cladding layer after UIT with titanium alloy pins is suggested. The chip from the pin (material transfer from the pin) and the mechanochemical oxidation is the main cause to form the cladding layer.

EQ70高强度低合金钢板经过超声冲击处理（UIT）和钛合金（Ti6Al4V）销进行了处理。利用能量色散X射线显微分析和X射线光电子能谱的扫描电子显微镜研究了EQ70钢表面的处理产品的结构，形态，表面化学状态和组成。在样品的表面和横截面上测量显微硬度。并在3.5 wt％NaCl介质中进行了电化学腐蚀测试，以评估具有不同冲击强度和不具有UIT的UIT处理的试样的耐腐蚀性。发现带有Ti6Al4V引脚的UIT可以在钢板表面上形成混合的氧化物熔覆层，其厚度随冲击强度（处理时间）而增加。包层中的元素主要来自冲击销（Ti，Al，V），贱金属（Fe）和气氛（O），并且这些元素的含量不会随冲击强度而显着变化。二氧化钛_由图2可知，FeO和Fe ₂ O ₃是包覆层中的主要氧化物。发现了销钉与处理过的贱金属之间的材料转移的相互影响。覆盖层的表面硬度随着冲击强度而增加，当冲击强度超过1.33s / mm ²时达到几乎恒定的值（约为母体材料的硬度的两倍）。覆层可以改善EQ70钢的耐腐蚀性能，并获得最佳的耐腐蚀性能，冲击强度范围为1.00至1.33 s / mm ²。建议用钛合金销钉进行UIT后覆层的可能形成步骤。来自销的切屑（来自销的材料转移）和机械化学氧化是形成覆层的主要原因。