Abstract The chloride induced corrosion behavior of cold drawn pearlitic steel wires was systematically investigated using electrochemical measurements, namely, electrochemical impedance spectroscopy, and local electrochemical impedance spectroscopy for micro-areas. A 0.05 mol/L NaCl solution mixed with borate buffer solution (pH = 8.45) was used. The results suggest that the corrosion resistance of cold-drawn pearlitic steel decreases with increasing strain to 0.8, but increases with strain up to a value of 1.6. Microstructure evolution was characterized by electron back scatter diffraction in combination with scanning electron microscopy and transmission electron microscopy. Atom probe tomography was used to quantify the cementite decomposition. The quantitation of microstructural parameters with strain suggests that the evolution of defect structure markedly increases the corrosion susceptibility of pearlite for strain up to 0.8. In the case of strain 1.6, refinement of the lamellar structure and cementite decomposition can reduce the volume fraction of cementite that acts as the cathode per corrosion unit (a pearlite/cementite “cell”), giving rise to an increase in the corrosion resistance.

中文翻译：

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冷拔珠光体钢丝的氯化物腐蚀行为

摘要 利用电化学测量系统研究了冷拔珠光体钢丝的氯化物诱导腐蚀行为，即电化学阻抗谱和微区局部电化学阻抗谱。使用与硼酸盐缓冲溶液 (pH = 8.45) 混合的 0.05 mol/L NaCl 溶液。结果表明，冷拔珠光体钢的耐蚀性随着应变增加到 0.8 而下降，但随着应变增加到 1.6 时增加。微观结构演变的特点是电子背散射衍射结合扫描电子显微镜和透射电子显微镜。原子探针断层扫描用于量化渗碳体分解。随着应变的微观结构参数的定量表明，缺陷结构的演变显着增加了珠光体对应变的腐蚀敏感性，最高可达 0.8。在应变 1.6 的情况下，层状结构的细化和渗碳体分解可以降低作为每个腐蚀单元（珠光体/渗碳体“单元”）阴极的渗碳体的体积分数，从而提高耐腐蚀性。