摘要
采用光学传感器辅助氧气消耗法研究了不同湿度下灰口铸铁样片的腐蚀速率。用体视显微镜、扫描电子显微镜(SEM)、显微傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、X射线光电子能谱(XPS)对样片表面锈蚀产物的形貌和结构进行表征。结果表明:随着环境湿度的升高,灰口铸铁样片的氧气消耗速率明显增加,相对湿度80%下的耗氧速率是30%条件下的20倍;所有湿度条件下样片表面均产生两种不同宏观表现的锈蚀区域,一种是以有机酸腐蚀产物为主的红棕色区域,一种是发生明显刻蚀的花纹状区域;两种区域内都存在有机酸锈蚀产物、不同晶相的羟基氧化铁(FeOOH)、不同晶相的三氧化二铁(Fe_(2)O_(3))和氧化亚铁(FeO);其中有机酸产物来源于调湿材料的自由释放。
The corrosion rate of gray cast iron samples under different humidity was studied by optical sensor assisted oxygen consumption method. The morphology and structure of the corrosion products on the sample surface were characterized by stereomicroscopy, scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The results showed that with the increase of ambient humidity, the oxygen consumption rate of gray cast iron samples increased significantly. The oxygen consumption rate at 80% relative humidity was 20 times that at 30%. At all humidity, there were two different kinds of corrosion areas on the samples′ surface. One of them was the reddish-brown area dominated by organic acid corrosion products, and the other was the obviously etched pattern area. There were organic acid corrosion products, ferrous oxide(FeO), hydroxyl iron oxide(FeOOH) and iron oxide(Fe_(2)O_(3)) in different crystal phases in the both regions. The organic acid product was caused by the free release of fiber humidity control material.
作者
许梦颖
王克青
张然
XU Mengying;WANG Keqing;ZHANG Ran(National Museum of China,Beijing 100006,China)
出处
《腐蚀与防护》
CAS
北大核心
2022年第10期76-83,共8页
Corrosion & Protection
基金
国家重点研发计划(2020YFC1522100)。
关键词
氧气消耗
灰口铸铁
腐蚀
文物保护
oxygen consumption
gray cast iron
corrosion
heritage conservation
