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稀硫酸容易与钢铁反应并产生氢气,常温下,60% (质量)及以上浓度的硫酸会在钢铁表面形成钝化膜而使钢铁对它有耐蚀性93% (质量)以上时即使加热到煮沸条件也几乎不腐蚀钢铁。 为了防止或减轻这种腐蚀,保证生产的顺利进行,各种硫酸设备的材料必须根据硫酸的腐蚀特性以及各种材料的耐蚀性能进行正确的选择和合理的使用。 铬不锈钢、铬镍不锈钢和铬镍钼不锈钢相似,在室温浓硫酸中具有较好的耐蚀性,随着温度的升高腐蚀率也明显升高。 在60℃以上的浓硫酸中,使用寿命较短,不宜采用。

由于硫酸的强烈腐蚀性, 使生产硫酸和使用硫酸的设备造成了严重的腐蚀。为了防止或减轻这种腐蚀, 保证生产的顺利进行,各种硫酸设备的材料必须根据硫酸的腐蚀特性以及各种材料的耐蚀性能进行正确的选择和合理的使用。 18-8型铬镍奥氏体不锈钢(如304不锈钢、304L不锈钢等)由于不含钼,所以不耐稀硫酸、中等浓度硫酸腐蚀,也不能用于有硫酸腐蚀的环境。 耐点蚀和缝隙腐蚀: 高含量的钼和铬使其耐点蚀当量值(PREN)非常高(通常 >33),抗氯化物局部腐蚀能力很强。 耐应力腐蚀开裂: 高镍含量使其比标准奥氏体不锈钢(如304、316)更耐氯离子引起的应力腐蚀开裂。

真空泵产品在应用中接触的腐蚀性环境较多,尤其像化工类行业中,硫酸、盐酸等都是常见的腐蚀性介质。 因此在选型选材中,对不同的腐蚀介质要有针对性的选择。 这次螺杆风机厂家就和大家聊聊常见的金属对硫酸的耐腐蚀性表现如何。

②XD-4奥氏体耐热钢XD-4是以高铬镍为基础,同时以硅、氮和稀土等元素补充合金化的奥氏体耐热钢。 具有较高的高温强度和组织稳定性以及耐急冷急热性。 尤其是具有良好的高温抗氧化性、抗渗碳性和抗硫化腐蚀能力。 最高使用温度为1200℃。 254SMO合金特性: 高的钼含量以及高铬和氮含量使254SMO具有极优良的耐点腐蚀和耐 缝隙腐蚀 的性能。 铜的添加改善了在某些酸中的耐腐蚀性。 此外,由于它的较高的镍含量和高的 铬、钼含量,使254SMO具有很好的抗 应力腐蚀破裂 的性能。 总之,钛合金在浓硫酸中的表现最好,其耐腐蚀性能显著优于不锈钢和铝合金,这主要是由于钛的化学性质和其氧化膜的稳定性所致。

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