鋅腐蝕的影響
(中國科學(xué)院 金屬研究所
金屬腐蝕與防護(hù)國家重點(diǎn)實驗室， 沈陽 110016)
摘 要: 交流阻抗測試技術(shù)等方 利用微生物分析、法， 研究了在不同濕度的類型土壤中硫酸鹽還原菌同一對純鋅腐蝕的影響。 結(jié)果明： 土壤濕度對菌類生長表的影響是顯著的， 硫酸鹽原菌量隨著濕度的提高有遞還增現(xiàn)象； 在不同的濕度 接菌土壤中純鋅腐蝕速率下，和點(diǎn)蝕深度都明顯大于滅壤; 隨著含水量的增大， 菌土純鋅腐蝕速率也增大， 壤含水量增大到10％～15%當(dāng)土?xí)r， 腐蝕速率達(dá)到最大，后腐蝕速率隨著濕度增大 然而趨于減小； 純鋅在接菌菌土壤中的阻抗圖譜均表及滅現(xiàn)為單容抗半圓， 在接菌中阻抗值及阻抗半圓均比土壤在滅菌土壤中小很多， 說酸鹽還原菌增大了純鋅在明硫土壤中的腐蝕速率。
關(guān)鍵字: 純鋅； 硫酸鹽還原菌； 土壤濕度； 微生物腐蝕
（State Key Lab for Corrosion and Protection of Metals,
Institute of Metals Research,
The Chinese Academy of Sciences,Shenyang 110016, China）
Abstract:The effects of sulfate reducing bacterial (SRB) on corrosion of zinc in different humidity soils were studied by using bacterial analyses, electrochemical impedance spectroscopy(EIS). The results show that the growth and metabolism of SRB increase with the increasing of humidity of soil. The corrosion rate and corrosion pitting depth of zinc in different humidity soils with SRB are larger than those in soils without SRB. The corrosion rate of zinc increases with the increasing of soil humidity and reaches the peak in 10%~15% water content soils, then decreases with the increasing of soil humidity. The EIS spectra exhibits single-layer model in soils with SRB and without SRB. The impedance of zinc in soils with SRB is smaller than those in soils without SRB. The results indicates that the corrosion rate of zinc increases in soils with SRB.
Key words: zinc; SRB; soil humidity; microbiologically influenced corrosion
