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以0.1 mol·L~(-1)NaCl+0.01 mol·L~(-1)NaHSO_3溶液为腐蚀介质,采用干/湿周浸加速腐蚀实验、腐蚀失重、X射线衍射、扫描电镜和能谱分析等方法,研究了湿热工业海洋大气中低碳钢的腐蚀行为.结果表明:实验钢的腐蚀过程均遵循幂函数d=At~n分布规律,钢种不同,常系数A、n的值不同;腐蚀产物主要由非晶物质和少量Fe_3O_4、α-FeOOH、β-FeOOH、γ-FeOOH晶体组成.所得锈层可分为主体锈层和界面疏松带两部分,由内至外锈层中Fe、O含量梯度变化很小.Cl~-、SO_2与水分的长期协同作用会导致内锈层结构变差,而添加稳定性或耐蚀性较高的元素可以改善锈层质量,进而增强钢材的耐腐蚀性能.
The wet etching immersion test was carried out using 0.1 mol·L -1 NaCl + 0.01 mol·L -1 NaHSO 3 solution as corrosion medium, corrosion loss, X-ray diffraction, SEM and EDS Et al. The corrosion behavior of low carbon steel in wet and hot industrial marine atmosphere was studied. The results showed that the corrosion process of experimental steel obeys the law of power function d = At ~ n. Different types of steel, the values of constant coefficients A and n are different. The corrosion products mainly consist of amorphous materials and a small amount of Fe 3 O 4, α-FeOOH, β-FeOOH and γ-FeOOH crystals.The rust layer can be divided into two parts: the main rust layer and the loose interface zone, O content gradient change is very small.Cl ~ -, SO2 and water long-term synergies will lead to deterioration of the internal rust layer structure, and add stability or corrosion resistance of the elements can improve the quality of the rust layer, thereby enhancing the resistance of steel Corrosion performance.