3种13Cr110钢高温高压CO_2腐蚀行为对比研究

Comparative Study of CO_2 Corrosion Behavior of Three 13Cr Steels under High Temperature and High Pressure

为了对比评价3种13Cr钢耐CO_2腐蚀性能,在模拟CO_2腐蚀环境中,采用高温高压釜对3种钢的CO_2腐蚀行为进行了试验研究。结果表明,3种钢的CO_2腐蚀速率以B13Cr110S、B13Cr110、HP13Cr110的顺序增大,B13Cr110S钢的腐蚀速率随温度升高变化不大,而B13Cr110和HP13Cr110钢则随温度升高而增加;B13Cr110S钢的CO_2腐蚀产物膜薄而致密,在较高温度下B13Cr110和HP13Cr110钢形成的腐蚀膜易干裂,但3种钢在该试验介质中均发生了均匀腐蚀;3种钢的腐蚀膜组成各不相同,但均含有Fe和Cr元素的氢氧化物及其失水后的氧化物。

Three 13Cr steels were tested in simulated CO2 environment with autoclave to evaluate＇and compare their corrosion behavior. The results showed that the order of CO2 corrosion rates of these three steels is B13Cr110S〈B13Cr110 HP13Cr110; the corrosion rate of B13Cr110S steel does not vary markedly with temperature, but that of B13Cr110 and HP13Cr110 steels increase with temperature. The corrosion product scale of B13Cr110S steel is thin and compact, but that of B13Cr110 and HP13Cr110 steels formed at higher temperature dehisced easily in dry environment. The three steels are all corroded by uniform corrosion in the corrosion solution, but the compositions of corrosion product scales are different from each other with a common character that the corrosion product are consisted of hydrates of Fe and Cr elements and their evaporated oxides from the hydrates.