论文部分内容阅读
在50℃的地热水中进行了一个月的现场试验。利用失重试验对若干种金属材料在不同暴露条件下的腐蚀速度进行了测定;利用掛片对某些表面保护层的保护性能进行了观察比较;并用线性极化方法测定了间浸条件下金属腐蚀速度随时间的变化关系。试验结果表明:碳钢和低合金钢在低温地热系统中具有相似的耐蚀性,全浸条件下均匀腐蚀速度为0.05毫米/年左右,半浸为0.2毫米/年左右,气相为0.3毫米/年左右,在最恶劣的间浸条件下也不超过0.5毫米/年。如果能设法防止氧进入系统,其腐蚀速度可以大大降低。2Cr13不锈钢有良好的耐均匀腐蚀能力,但半浸条件下在水线附近出现了孔蚀。铝由于严重的孔蚀,不宜在这样的体系中采用。铜及铜合金在氧和硫化氢的联合作用下腐蚀被大大加速了。在保证较严格的施工条件下,RTF涂料在这种体系中能成功地保护金属基体。环氧煤沥青相对经济易得、施工简便,可对基体进行较好的保护,是用于这种体系中有希望的涂层。
A one-month field trial was conducted in geothermal water at 50 ° C. The corrosion rate of some kinds of metal materials under different exposure conditions was measured by weight loss test. The protective properties of some surface protective layers were observed and compared by using coupons. The metal polarization The relationship between speed and time. The results show that carbon steel and low alloy steel have similar corrosion resistance in low temperature geothermal system. The uniform corrosion rate under full immersion is about 0.05 mm / year, the half immersion is about 0.2 mm / year, the gas phase is 0.3 mm / Year or so, no more than 0.5 mm / year under the worst conditions of immersion. If you can try to prevent oxygen from entering the system, its corrosion rate can be greatly reduced. 2Cr13 stainless steel has good resistance to uniform corrosion, but half-immersed conditions in the water near the emergence of pitting. Aluminum due to severe pitting, should not be used in such a system. Corrosion of copper and copper alloys is greatly accelerated by the combined action of oxygen and hydrogen sulfide. Under the more stringent construction conditions, RTF coatings can successfully protect the metal matrix in this system. Epoxy coal tar relatively easy to get the economy, easy construction, the matrix can be better protected, is used in this system promising coating.