氯離子和直流電流密度對(duì)X65鋼的腐蝕研究
本文選題:氯離子 切入點(diǎn):直流雜散電流 出處:《表面技術(shù)》2017年08期
【摘要】:目的通過(guò)浸泡實(shí)驗(yàn)和腐蝕圖像表征方法研究氯離子和直流雜散電流共同作用下X65鋼的腐蝕特征。方法通過(guò)浸泡實(shí)驗(yàn),在不同氯離子濃度和直流電流密度的共同作用下,通過(guò)失重法計(jì)算X65鋼的均勻腐蝕速率。通過(guò)三維顯微鏡對(duì)浸泡后的腐蝕形貌進(jìn)行觀察,確定其主要腐蝕形態(tài)和發(fā)展規(guī)律。結(jié)果在不同的氯離子濃度下,X65鋼的均勻腐蝕速率基本不變,誤差主要來(lái)自于腐蝕產(chǎn)物清洗不徹底和環(huán)氧樹(shù)脂吸水的差異性。而腐蝕速率與直流電流密度成正比,氯離子主要作用是使試片形成不同的局部腐蝕特征,破壞了試片表面的均勻腐蝕,而加劇了局部腐蝕,但對(duì)整體的腐蝕速率基本沒(méi)有影響。結(jié)論引起管道腐蝕失重的主要因素為流出管道的直流電流密度,而與所處環(huán)境無(wú)關(guān)。低氯離子濃度是導(dǎo)致局部腐蝕的主要原因,隨著氯離子濃度的增大,腐蝕逐漸向均勻腐蝕轉(zhuǎn)變。直流電流密度造成的腐蝕以均勻腐蝕為主。
[Abstract]:Aim to study the corrosion characteristics of X65 steel under the action of chloride ion and DC stray current by immersion test and corrosion image characterization.Methods the uniform corrosion rate of X65 steel was calculated by weightlessness method under the combined action of different chloride concentration and DC current density.The corrosion morphology after immersion was observed by three dimensional microscope, and the main corrosion morphology and development law were determined.Results the uniform corrosion rate of X65 steel was almost unchanged at different chloride concentration, and the error was mainly due to the incomplete cleaning of corrosion products and the difference in water absorption of epoxy resin.The corrosion rate is directly proportional to the DC current density. The main action of chloride ion is to make the specimen form different local corrosion characteristics, destroy the uniform corrosion on the surface of the test piece, and aggravate the local corrosion, but it has no effect on the overall corrosion rate.Conclusion the main factor of corrosion weightlessness of pipeline is the DC current density of outlet pipe, but it has nothing to do with the environment.Low chloride concentration is the main cause of local corrosion. With the increase of chloride concentration, corrosion gradually changes to uniform corrosion.The corrosion caused by DC current density is mainly uniform corrosion.
【作者單位】: 浙江金衢麗天然氣有限公司;
【分類號(hào)】:TG178
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