Abstract

The tribological impact of the steel alloy employed as the work roll material during hot rolling on the surface quality and corrosion behavior of Al-Mn alloys was explored. AISI 52100, AISI D2 and AISI 440C steel work rolls with a surface roughness (R_a) of 0.1 µm were used to hot roll Al-Mn alloy specimens under similar conditions using a rolling tribo-simulator. Corrosion tests were then performed on the rolled Al-Mn specimens by immersing them in a 0.5 wt.% NaCl solution. Surface examination of the Al-Mn specimens after rolling revealed dark MgO-rich islands covering the surfaces of the AISI D2 and AISI 440C-rolled Al-Mn surfaces. These features were associated with the carbides observed protruding from the AISI D2 and AISI 440C steel surfaces. Subsequent corrosion tests revealed that these MgO-rich islands possessed a distinct influence on the corrosion behavior of the rolled Al-Mn surfaces. The frequency of occurrence and depth of the MgO-rich islands, which were dependent on the work roll material employed, influenced the initial and subsequent corrosion morphology detected on the Al-Mn surfaces. The preferential dissolution of the MgO-rich islands was detected as one of the corrosion mechanisms occurring during the early stages of corrosion.

中文翻译：

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工作辊材料对热轧铝锰合金腐蚀行为的影响

摘要

探索了热轧过程中用作工作轧辊材料的合金对铝锰合金表面质量和腐蚀行为的摩擦学影响。AISI 52100，AISI D2和AISI 440C钢制工作辊的表面粗糙度（R _a用一个滚动摩擦模拟器在相似的条件下使用0.1 µm的）热轧Al-Mn合金试样。然后通过将轧制的Al-Mn试样浸入0.5 wt％的NaCl溶液中进行腐蚀试验。轧制后的Al-Mn样品表面检查发现，深色的富含MgO的岛覆盖了AISI D2和AISI 440C轧制的Al-Mn表面。这些特征与从AISI D2和AISI 440C钢表面凸出的碳化物有关。随后的腐蚀测试表明，这些富含MgO的岛对轧制Al-Mn表面的腐蚀行为具有明显的影响。富MgO岛的出现频率和深度取决于所采用的工作辊材料，影响了在Al-Mn表面检测到的初始和随后的腐蚀形态。富MgO岛的优先溶解被检测为腐蚀早期阶段发生的腐蚀机制之一。