不同生物炭进入土壤后对304不锈钢腐蚀的影响

生物炭在土壤应用过程,不可避免地会对与土壤之间接触的机械设备部分产生腐蚀作用。为探究生物炭应用于农业生产中对机械设备以及金属工具损耗的影响,采用分别在700、400和100℃温度下裂解制备的小麦秸秆生物炭(WB)、水稻秸秆生物炭(RB)和松木生物炭(PB)的生物炭对304不锈钢板材进行腐蚀处理,并测量其极化曲线和电化学阻抗谱和腐蚀表现。结果表明:与空白组(CK)对比,相较于304不锈钢的腐蚀速率,在施入WB的土壤中,腐蚀速率会随着WB裂解温度的增大而增大;而加入RB的土壤会加剧不锈钢的腐蚀,其中在加入400℃RB的土壤中腐蚀速率达到最大;这是因为WB和RB的加入会提升土壤中的Cl~-含量至足以达到点蚀效应的程度加速了不锈钢板材的腐蚀。与此同时,发现100℃制备的PB生物炭可以抑制不锈钢的腐蚀。总而言之,不同生物质和制备温度的生物炭在土壤实际应用中表现出不同的腐蚀和抗腐蚀特性,因此深入研究这些方面将为其农业应用具有深远影响。

Effects of different biochar into soil on the corrosion of 304 Stainless Steel

Agricultural machinery is greatly affected by the corrosive effects of biochar additions in the soil. However, there has been little research on the response of 304 stainless steel to different biochar additions in soil. Nine types of biochar, wheat biochar (WB), rice biochar (RB), and pine biochar (PB) prepared with the corresponding temperatures at 700 °C, 400 °C, and 100 °C respectively, were selected for corrosive experiments. Polarization curves and electrochemical impedance were used to determine the properties of 304 stainless steel affected by different temperature-dependent biochar. The results showed that corrosion of the 304 stainless steel surfaces accelerated with increasing biochar production temperatures in RB and WB. However, PB showed a completely different effect on 304 stainless steel, which induced an electrochemical impedance. In conclusion, biochar of different materials exhibited different effects on the corrosion of agricultural machinery at different production temperatures. In the long term, deepening research on this aspect of study may have a significant and meaningful influence on its practical application.