采用全浸试验和动电位极化方法比较了四种不同的仿古铸铁在3.5%NaCl溶液中的腐蚀行为.结果表明,仿古灰口铸铁的腐蚀速率较仿古白口铸铁高;两种灰口铸铁中,低硫试样较高硫试样的腐蚀速率高,耐腐蚀性能差;两种白口铸铁中,低硫含量的试样与高硫含量的腐蚀速率和耐腐蚀性能均接近;X射线衍射仪分析表明四种铸铁的腐蚀产物均含有纤铁矿、磁铁矿和针铁矿,其中疏松不稳定的纤铁矿含量最多,并未发现海水打捞铁器中常见的腐蚀产物-四方纤铁矿.
The corrosion behavior of four kind of cast irons made according to the composition of several ancient cast irons in 3.5%NaCl solution were investigated by using immersion test and potentiodynamic polarization measurement.The results showed that the corrosion rate of the grey cast irons was higher than that of the white cast irons.The grey iron with low sulfur content showed a higher corrosion rate and poor corrosion resistance in comparison with that with high sulfur;but for the white irons,the sulfur content showed no significant effect on their corrosion properties.XRD spectra analysis indicated that lepidocrocite,magnetite and goethite existed in the corrosion products of all four cast irons,among which the loose,unstable lepidocrocite was predominant.Akaganeite,the most commonly seen corrosion product for ironwares excavated from the sea,however,had not been seen among the examined corrosion products.
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