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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Flow Rate on the Corrosion Products Formed on Traditional and New Generation API 5L X-70 in a Sour Brine Environment
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Effect of Flow Rate on the Corrosion Products Formed on Traditional and New Generation API 5L X-70 in a Sour Brine Environment

机译：酸水环境中流速对传统和新一代API 5L X-70上形成的腐蚀产物的影响

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The effect of chemical composition on the nature of the corrosion products formed on pipe steels API5L X-70 traditional and API 5L X-70 new generation was studied. General corrosion was inducedunder different flow rates (1~4 m/s) in a rotating disc electrode immersed in a sour brine solution withkerosene at 60 C. Linear polarization resistance indicated that API 5L X-70 NG displayed a highercorrosion resistance because of the presence of copper, which promoted a greater amount of oxidesthan sulfides on surface in comparison to those formed in the traditional pipe steel. Moreover, ferriteincreased (70-95%) and perlite decreased (30-5%) in NG steel to protect steel from further dissolution.Scanning electron microscopy of traditional steel displayed the presence of a larger amount ofcorrosion products with evident porosity and bush shape morphology, whereas corrosion products onNG pipe steel looked similar but more coherent and both covered most of the steel surfaces. X-raydiffraction analysis showed that the corrosion products are mainly composed of a mixture of oxides(maghemite, hematite, magnetite), and sulfides (mackinawite, troilite, pyrite, marcasite and smithite)only in the immersion tests. The protective function of corrosion products on the API 5L X-70 NGsurface turned out to be better because of the presence of one different phase, triclinic pirite, that seemsmore stable than cubic pyrite in traditional steel. The presence of copper in new generation steel inapproximately twice as much compared to the traditional steel, which apparently favored the cathodicreaction where oxygen is formed. Chromium and nickel delayed anode reaction, ferrite dissolution,and helps to decrease corrosion rate.
机译：研究了化学成分对传统钢管API5L X-70和新一代API 5L X-70上形成的腐蚀产物的性质的影响。在60℃的煤油溶液中浸没在旋转的圆盘电极中，在不同流速（1-4m / s）下会引起全面腐蚀。线性极化电阻表示API 5L X-70 NG由于存在而表现出较高的耐蚀性。铜，与传统钢管中形成的氧化物相比，在表面产生的氧化物多于硫化物。此外，NG钢中的铁素体含量增加（70-95％），珍珠岩减少（30-5％），以防止钢进一步溶解。传统钢的扫描电子显微镜显示大量腐蚀产物的存在，具有明显的孔隙率和灌木状形态，而NG管道钢上的腐蚀产物看起来相似但更连贯，并且都覆盖了大部分钢表面。 X射线衍射分析表明，仅在浸没试验中，腐蚀产物主要由氧化物（磁赤铁矿，赤铁矿，磁铁矿）和硫化物（麦基钠铁矿，三叶铁矿，黄铁矿，镁铁矿和菱铁矿）的混合物组成。事实证明，API 5L X-70 NG表面上腐蚀产物的防护功能更好，这是因为存在一种不同的相，即三斜铁氧体，它比传统钢中的立方黄铁矿更稳定。与传统钢相比，新一代钢中铜的含量大约是传统钢的两倍，这显然有利于形成氧气的阴极反应。铬和镍会延迟阳极反应，铁素体溶解，并有助于降低腐蚀速率。

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