模拟北方酸雨对Q235钢腐蚀力学行为的试验研究  

Experimental Study on the Effect of Simulated Northern Acid Rain on the Corrosion Mechanical Behavior of Q235 Steel

作　　者：张童 刘海卿[1] 吕学涛 ZHANG Tong;LIU Hai-qing;LV Xue-tao(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;School of Resource and Civil Engineering,Liaoning Institute of Science and Technology,Benxi 117004,China;School of Transportation and Civil Engineering and Architecture,Foshan University,Foshan 528225,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁科技学院资源与土木工程学院,辽宁本溪117004 [3]佛山科学技术学院交通与土木建筑学院,广东佛山528225

出　　处：《材料保护》2022年第4期33-39,共7页Materials Protection

基　　金：国家自然科学基金项目(51208246);辽宁省教育厅基金(LJKZ1056)资助。

摘　　要：为研究北方酸雨对钢管混凝土构件力学性能的影响规律,亟需研究钢管在酸雨腐蚀条件下不同腐蚀程度力学性能的变化规律。为此,参照大连市历年酸雨统计的化学成分,采用人工配制模拟酸雨溶液进行室内加速腐蚀的方法,对Q235钢进行单调拉伸试验。结果表明:酸雨腐蚀后钢材表面易形成腐蚀坑;低腐蚀率(β≤10%)拉伸件的断口主要为正断破坏;高腐蚀率(25%≥β≥15%)拉伸件的断口主要为斜断破坏;模拟酸雨腐蚀后钢材的屈服强度、弹性模量、极限强度和伸长率随着腐蚀率的增加而减少,而泊松比随着腐蚀率的增加而增加。基于试验数据,回归出模拟酸雨腐蚀条件下Q235钢力学性能指标的简化经验公式,结果可为酸雨区钢管混凝土组合结构的设计及结构安全评估提供理论基础和科学依据。In order to study the influence law of northern acid rain on mechanical properties of concrete-filled steel tubular members,it is necessary to study the change law of mechanical properties of steel tube with different corrosion degree under acid rain corrosion condition.Hence,referring to the chemical composition of acid rain statistics over the years in Dalian City,the method of indoor accelerated corrosion with artificially prepared simulation acid rain solution was used to carry out monotonic tensile test on Q235 steel.Results showed that rust pits were easy to form on the steel surface after acid rain corrosion.The fracture of tensile coupons with low corrosion rate(β≤10%)was mainly normal fracture failure,while the fracture of tensile coupons with high corrosion rate(25%≥β≥15%)was mainly oblique fracture failure.Meanwhile,the yield strength,elastic modulus,ultimate strength,and elongation percentage of steel afterempirical acid rain corrosion decreased with the increase of corrosion rate,while Poisson’s ratio increased with the increase of corrosion rate.Based on the test data,the simplified empirical calculation formula of the mechanical properties index of Q235 steel under the condition of simulated acid rain corrosion condition was regressed,which could provide theoretical basis and scientific basis for the design and structural safety assessment of concrete-filled steel tubular composite structure in acid rain area.

关 键 词：酸雨腐蚀 Q235钢 单调拉伸试验 力学性能指标 

分 类 号：TG172.5[金属学及工艺—金属表面处理]