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采用单因素实验和正交实验,以腐蚀深度量为评价指标,研究了污泥的p H值和含水率,以及腐蚀温度、腐蚀时间和污泥种类对干燥器用两种金属腐蚀行为的影响规律。采用极差和方差分析,给出了各因素影响的主次顺序和不同因素对金属腐蚀影响的显著性,最后通过SEM和EDX对腐蚀产物进行表征。结果表明:Q235碳钢的腐蚀深度量随着温度、污泥含水率和污泥酸度的增加而逐渐增加;各因素对金属腐蚀深度量的影响主次顺序为:钢材种类、温度、污泥p H值、时间t、污泥种类;最大腐蚀条件为:腐蚀温度为100℃、腐蚀时间为288 h、污泥p H值为4.9、污泥种类为市政污泥、金属材料为Q235碳钢;污泥p H值和温度引起的腐蚀为非均匀腐蚀,而污泥含水率引起的腐蚀为均匀腐蚀。
Single factor experiments and orthogonal experiments were conducted to evaluate the p H value and moisture content of sludge and the influence of corrosion temperature, corrosion time and sludge types on the corrosion behavior of two metals in dryer . Using the range and variance analysis, the order of influence of each factor and the significance of different factors on the metal corrosion are given. Finally, the corrosion products are characterized by SEM and EDX. The results show that the corrosion depth of Q235 carbon steel increases with the increase of temperature, moisture content of sludge and acidity of sludge. The order of influence of each factor on the depth of corrosion is as follows: steel type, temperature, sludge p H value, time t and sludge types. The maximum corrosion conditions were as follows: the corrosion temperature was 100 ℃, the corrosion time was 288 h, the sludge p H value was 4.9, the sludge type was municipal sludge, and the metal material was Q235 carbon steel; The p H value and temperature-induced corrosion of the sludge are non-uniform and the corrosion caused by the moisture content of the sludge is uniform.