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为了加强铸铁文物的保护,采用动电位扫描极化、模拟闭塞电池、交流阻抗等电化学方法,以及光镜、扫描电镜等显微组织分析手段,研究了4种仿古铸铁在模拟土壤介质(0.06mol/L NaCl+0.03mol/L Na2SO4+0.01mol/L NaHCO3溶液)中的局部腐蚀行为,详细探讨了组织差异对仿古铸铁局部腐蚀的影响。结果表明:珠光体灰口铸铁的自腐蚀电位负移最为明显,在模拟土壤条件中裂纹和腐蚀孔洞相对其它几种仿古铸铁较多。在闭塞电池中,仿古铸铁的pH值下降,Cl-和SO42-增加,仿古铸铁耐蚀性依次递减的顺序为白口铸铁、麻口铸铁、珠光体+铁素体灰口铸铁、珠光体灰口铸铁。
In order to strengthen the protection of cast iron artifacts, four kinds of antique cast iron were studied in simulated soil medium (0.06) using the methods of potentiodynamic scanning polarization, simulated occluded cells, electrochemical impedance spectroscopy and other microscopic analysis methods such as light microscope and scanning electron microscope mol / L NaCl + 0.03mol / L Na2SO4 + 0.01mol / L NaHCO3 solution). The effects of different microstructures on the local corrosion of the cast iron were discussed in detail. The results show that the negative corrosion potential of pearlite gray cast iron is the most obvious. Compared with other types of antique cast iron, the number of cracks and corrosion holes in simulated soil condition is more. In the occluded batteries, the pH value of antique cast iron decreased, the Cl- and SO42- increased, and the corrosion resistance of antique cast iron decreased in the order of white cast iron, hemp cast iron, pearlite + ferrite gray cast iron, pearlite gray Cast iron.