温度对P110钢CO_2腐蚀行为的影响

EFFECT OF TEMPERATURE ON CO_2 CORROSION BEHAVIOUR OF P110 STEEL

在模拟油田实际腐蚀环境中研究了温度对P110钢CO2 腐蚀行为的影响.用SEM、XRD等分析了在不同温度条件下材料表面腐蚀产物膜的形貌以及对腐蚀速率和腐蚀形态的影响.结果表明,4 0℃时表层腐蚀产物类似于疏松的土壤,少且很松散地附着在材料表面,成份主要是溶液中沉积的KCl.90℃时腐蚀产物主要是钙铁镁的碳酸盐和少量的KCl和Fe2 O3 ,腐蚀产物呈颗粒状,较致密但是膜层中含有大量的孔洞.14 0℃时,试样表层腐蚀产物呈致密的粘土形貌、下层腐蚀产物仍是颗粒状,产物层致密,成份主要是FeCO3 和KCl.不同温度下不同的腐蚀产物形貌造成随温度升高。

Influences of temperature on CO 2 corrosion behaviors of P110 steel were studied in stimulated oilfield environments.Morphologies of scales and their effects on corrosion rate and corrosion shape were analyzed by SEM and XRD.The results showed,at 40℃,corrosion products were similar to loosen soil,few and hanging on the surface of the material composed by deposited KCl.In 90℃,corrosion products were grains,compact and much holes in it,constituted by calcium/magnesium/iron carbonate and few KCl and Fe 2O 3.In 140℃,corrosion products were in the similar morphology as compact clay in the outer layer and grains in the inner layer,made up of FeCO 3 and KCl.The phenomena of different morphology in different temperature resulted in that the maximal corrosion rate presented in 90℃.