钢的大气暴露腐蚀与室内模拟加速腐蚀的相关性

INVESTIGATION ON INTERRELATION OF INDOOR ACCELERATED CORROSION AND ATMOSPHERIC EXPOSURE CORROSION OF STEELS

通过大气暴露试验和实验室的浸渍干燥湿润复合循环试验 ,结合腐蚀产物的表面分析 ,研究了 4种钢在沈阳地区的大气腐蚀规律和模拟大气腐蚀过程的腐蚀规律 .结果表明 :在大气暴露试验和室内模拟加速腐蚀试验中 ,4种钢的腐蚀产物都具有不同程度的保护性 ,腐蚀规律可用ΔW =Ktn 公式描述 ,室内外腐蚀试验结果有较好的相关性 .采用 0 0 1mol/LNaHSO3 +0 .0 0 1mol/LNaCl介质为加速剂 ,通过干湿复合循环试验 ,可模拟钢在沈阳大气环境中的腐蚀过程 ,近似推测户外长期暴露试验的结果 .

The law of atmospheric corrosion of 4 steels in Shenyang area was studied by means of atmospheric exposure tests and their corrosion products were analyzed by XRD and IRAS.For comparison,an accelerated weathering tests of immersion-dry-wet combined cycles with the medium of NaHSO 3 and NaCl was used to simulate the field corrosion process.The results showed that,in the two conditions of field and laboratory,the corrosion process of steels could be described by a formulary of ΔW=Ktn;the main corrosion products are α-FeOOH and γ-FeOOH.It is obvious that there exists a rather good the interrelation between simulating accelerated corrosion and atmospheric exposure corrosion.The corrosion process of steels in Shenyang atmosphere could be simulated by accelerated weathering tests of immersion-dry-wet combined cycles with the medium of 0.01 mol/L NaHSO 3 and 0.001 mol/L NaCl.