CN110743766A - 一种天然气管道防腐方法 - Google Patents

一种天然气管道防腐方法 Download PDF

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CN110743766A
CN110743766A CN201911084986.4A CN201911084986A CN110743766A CN 110743766 A CN110743766 A CN 110743766A CN 201911084986 A CN201911084986 A CN 201911084986A CN 110743766 A CN110743766 A CN 110743766A
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赵海阳
李�灿
刘建
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Jiangsu Kedun Testing Technology Co Ltd
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Abstract

本发明公布了一种地埋燃气管道防腐方法，该方法对管道内外设置防腐层，提高管道防腐效果，防腐层使用石墨烯底漆涂层加石墨烯面漆涂层，可以有效地将腐蚀介质(如水、氧气、酸碱盐等)与被保护金属隔离，阻止腐蚀发生，并且石墨烯底漆涂层中掺杂锌粉，对管道起到阴极保护作用，聚乙烯保护层可以减少管道外部涂层破损，该方法防腐效果好，使用成本低，实用性强。

Description

一种天然气管道防腐方法
技术领域
本发明涉及管道防腐领域，尤其是一种天然气管道防腐方法。
背景技术
燃气管道主要有碳钢材料制成，由于输送的燃气中含有少量水分、二氧化碳、硫化氢气体等腐蚀性杂质，长时间作用，会对管道内壁造成腐蚀；地埋管道外部由于土壤中的水、酸碱盐、矿物质、微生物及杂散电流作用，而导致腐蚀；管道腐蚀会导致设备破坏而引发事故，如火灾、***、气体泄漏等，除了造成经济损失以及环境破坏外，有时会伤及生命，因此，必须对腐蚀予以高度重视。
目前，管道防腐常用的方法是外加防腐层和加装阴极保护，常用的外防腐层主要是三层聚乙烯防腐层(3PE)，但是，防腐层与管道外壁附着力不够，造成防腐层的脱落，加速了钢管的腐蚀；因此，管道还会加装阴极保护装置，使被保护管道在电化学电池中为阴极而减缓其腐蚀，但是，由于安装不到位、测试桩维护不当等问题，阴极保护也很难达到较好的保护效果，并且安装和维护成本较高。
发明内容
本发明的目的是针对现有技术的不足，提供一种防腐效果好、使用成本低、具有阴极保护作用、内外防腐的地埋燃气管道防腐方法。
本发明采用的技术方案：一种天然气管道防腐方法，主要包括以下步骤：
(1)将管道内表面进行打磨、清洗、烘干，再将石墨烯底漆涂料二均匀涂在管道内表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料二涂布在石墨烯底漆涂料二上，厚度为0.1mm，最后室温固化，形成管道内防腐层。(2)将管道外表面进行打磨、清洗、烘干，再将石墨烯底漆涂料一均匀涂在管道外表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料一涂布在石墨烯底漆涂料一上，厚度为0.1mm，然后石墨烯面漆涂料二上加一层聚乙烯保护层，厚度为1.5mm，最后室温固化，形成管道外防腐。
所述的石墨烯底漆涂料的制备：按一定比例将环氧树脂、锌粉、石墨烯粉体等填料在分散设备中搅拌均匀，然后加入其他助剂和溶剂，用研磨机研磨至一定细度，再过滤即可得到石墨烯底漆涂料；
所述的石墨烯面漆涂料的制备：按一定比例将环氧树脂、云母氧化铁、石墨烯粉体填料在分散设备中搅拌均匀，然后加入其他助剂和溶剂，用研磨机研磨至一定细度，再过滤即可得到面漆涂料；
所述的石墨烯底漆涂料成分：环氧树脂25-35份，锌粉30-50份，石墨烯粉体1-2份，其他助剂和溶剂15-20份；
所述的石墨烯面漆涂料成分：环氧树脂35-45份，云母氧化铁20-40份，石墨烯粉体1-3份，其他助剂和溶剂20-30份；
所述的石墨烯底漆涂料厚度为0.05-0.06mm，石墨烯面漆涂料厚度为0.1-0.2mm，聚乙烯保护层厚度为1-2mm；
本发明的有益效果：
(1)石墨烯底漆涂层中掺杂一些自腐蚀电位比金属管道电位更负的锌粉，在发生腐蚀的过程中，涂层内含有的锌粉作为阳极被优先腐蚀，从而延缓了金属管道腐蚀反应的发生和发展，使金属管道得到有效保护；
(2)石墨烯底漆涂层加石墨烯面漆涂层，综合防护性能更好，可以有效提高物理屏蔽作用，使腐蚀介质(如水、氧气、盐雾等)与被保护金属隔离，从而防止形成腐蚀电池或抑制其扩散；
(3)聚乙烯保护层可以保护管道外部涂层，有效减少管道安装过程中人为因素导致石墨烯涂层的破坏；
(4)对管道内外设置防腐层，提高管道保护效果，减少腐蚀发生，该方法增强防腐效果，降低使用成本，实用性强。
附图说明
图1：管道防腐层截面示意图。
图中，1-管道，2-石墨烯底漆涂料一，3-石墨烯面漆涂料一，4-聚乙烯保护层，5-石墨烯底漆涂料二、6-石墨烯面漆涂料二。
具体实施方式
下面结合附图与具体实例对本发明进行详细说明：
一种天然气管道防腐方法，包括：
(1)将管道1内表面进行打磨、清洗、烘干，再将石墨烯底漆涂料二5均匀涂在管道1内表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料二6涂布在石墨烯底漆涂料二5上，厚度为0.1mm，最后室温固化，形成管道内防腐层。
(2)将管道1外表面进行打磨、清洗、烘干，再将石墨烯底漆涂料一2均匀涂在管道1外表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料一3涂布在石墨烯底漆涂料一2上，厚度为0.1mm，然后石墨烯面漆涂料二3上加一层聚乙烯保护层4，厚度为1.5mm，最后室温固化，形成管道外防腐。
石墨烯底漆涂料的制备：将30份环氧树脂、45份锌粉、1份石墨烯粉体在分散设备中搅拌均匀，然后加入24份其他助剂和溶剂，用研磨机研磨至一定细度，再过滤，即可得到石墨烯底漆涂料；
石墨烯面漆涂料的制备：将40环氧树脂、30份云母氧化铁、2份石墨烯粉体分散设备中搅拌均匀，然后加入28份其他助剂和溶剂，用研磨机研磨至一定细度，再过滤即可得到面漆涂料；
上面对本专利的较佳实施方式作了详细说明，但是本专利并不限于上述实施方式，在本领域的普通技术人员所具备的知识范围内，还可以在不脱离本专利宗旨的前提下做出各种变化。

Claims (4)

1.一种天然气管道防腐方法，其特征在于按以下步骤进行：
(1)将管道内表面进行打磨、清洗、烘干，再将石墨烯底漆涂料二均匀涂在管道内表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料二涂布在石墨烯底漆涂料二上，厚度为0.1mm，最后室温固化，形成管道内防腐层；
(2)将管道外表面进行打磨、清洗、烘干，再将石墨烯底漆涂料一均匀涂在管道外表面上，厚度为0.05mm，一段时间后，将石墨烯面漆涂料一涂布在石墨烯底漆涂料一上，厚度为0.1mm，然后石墨烯面漆涂料二上加一层聚乙烯保护层，厚度为1.5mm，最后室温固化，形成管道外防腐。
2.根据权利要求1所述的一种天然气管道防腐方法，其特征在于石墨烯底漆涂料的制备成分比例：环氧树脂25-35份，锌粉30-50份，石墨烯粉体1-2份，其他助剂和溶剂15-20份。
3.根据权利要求1所述的一种天然气管道防腐方法，其特征在于石墨烯面漆涂料的制备成分比例：环氧树脂35-45份，云母氧化铁20-40份，石墨烯粉体1-3份，其他助剂和溶剂20-30份。
4.根据权利要求1所述的一种天然气管道防腐方法，其特征在于石墨烯底漆涂料厚度为0.05-0.06mm，石墨烯面漆涂料厚度为0.1-0.2mm，聚乙烯保护层厚度为1-2mm。
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CN112538816A (zh) * 2020-12-22 2021-03-23 沈阳建筑大学 一种应用于海上建筑的新型高强防腐钢管混凝土桥墩
CN116475045A (zh) * 2022-12-31 2023-07-25 中国铁塔股份有限公司荆门市分公司 一种基于铁塔钢结构表面的石墨烯重防腐涂层除锈方法

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CN116475045A (zh) * 2022-12-31 2023-07-25 中国铁塔股份有限公司荆门市分公司 一种基于铁塔钢结构表面的石墨烯重防腐涂层除锈方法

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