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通过对比25钢在热带海洋环境下自然海水和无菌海水中的平均腐蚀深度,研究微生物对碳钢腐蚀行为的影响。结果表明,海水中微生物的存在显著影响碳钢的平均腐蚀深度。浸泡时间为365 d时,在自然海水中的腐蚀深度为无菌海水中的2.6倍,产生了明显的局部腐蚀。无菌海水和自然海水腐蚀都会造成材料抗拉强度的下降,对比发现腐蚀时间较长时自然海水中材料抗拉强度下降更大,说明微生物腐蚀对材料抗拉强度有一定影响。微生物腐蚀对材料抗拉强度的影响作用,主要在于微生物的存在使材料的平均腐蚀深度增大,引起材料横截面积的减小。微生物腐蚀并不会降低退火25钢的延伸率和夏比冲击功,实验过程中未发现微生物作用下材料的氢脆现象。
By comparing the average corrosion depth of 25 steel in natural seawater and sterile seawater under tropical marine environment, the effects of microorganisms on the corrosion behavior of carbon steel were studied. The results show that the presence of microorganisms in seawater significantly affects the average depth of corrosion of carbon steel. The immersion time of 365 days, the depth of corrosion in natural seawater 2.6 times in sterile seawater, had a significant local corrosion. Aseptic sea water and natural seawater corrosion will cause the tensile strength of the material to be reduced. It is found that the tensile strength of the material in natural seawater decreases more when the corrosion time is longer, which indicates that the microbial corrosion has a certain impact on the tensile strength of the material. Microbial corrosion on the tensile strength of the material effect, mainly due to the presence of microorganisms so that the average depth of corrosion of the material increases, causing the material cross-sectional area decreases. Microbial corrosion did not reduce the elongation and Charpy impact energy of the annealed 25 steel. No hydrogen embrittlement of the material was observed under the action of microorganisms during the experiment.