【摘要】 为研究生物质炭化釜长期使用后力学性能退化规律,根据电化学腐蚀原理,以乙酸、氯化钠配比电解质溶液,结合热处理,模拟炭化釜常用材料Q345R钢的腐蚀。通过扫描电子显微镜、X射线能谱分析,确认由于微电池的影响,试样取样方向和轧制方向的角度越小,试样表面点蚀现象越微弱。通过单轴拉伸试验确认,随着腐蚀率的提高,Q345R钢力学性能逐渐退化。当试样腐蚀率达到46.87%时,弹性模量降低12.95%,名义屈服强度降低13.85%,名义极限强度降低13.94%。在试验中,根据相关数据拟合建立了Q345R钢腐蚀率与强度的关系曲线。更多还原

【Abstract】 For studying the mechanical property degradation law of biomass carbonization kettle after long term use,in accordance with electrochemical corrosion principle,acetic acid and sodium chloride were matched to electrolyte solution,and together with heat treatment,the corrosion of Q345 R steel,which is commonly used in carbonization kettle,was simulated. Through scanning electron microscope and X ray energy spectrum analysis,it is confirmed that due to the influence of microbattery,the smaller the angle between sampling direction and rolling direction of the sample,the weaker the pitting phenomenon on the sample surface. It is confirmed by uniaxial tensile test that with the increase of corrosion rate,the mechanical property of Q345 R steel is gradually degraded. When the corrosion rate of the sample reaches 46. 87%,the elastic modulus decreases by 12. 95%,the nominal yield strength decreases by 13. 85%,and the nominal ultimate strength decreases by 13. 94%. In the test,the relationship curve between corrosion rate and strength of Q345 R steel was established by fitting the relevant data.更多还原