CN104451629A - 一种钢构输变电设备涂覆有机涂层前化学转化工艺 - Google Patents
一种钢构输变电设备涂覆有机涂层前化学转化工艺 Download PDFInfo
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Abstract
本发明公开了一种钢构输变电设备涂覆有机涂层前的化学转化工艺,该工艺属于钢材防腐技术领域,其工艺过程包括去污除锈、转化处理、水洗及干燥四个过程。其中所述转化处理液的成分为H3PO420-50g/L、ZnO10-20g/L、MnH2PO410-15g/L、促进剂50-100g/L、络合剂10-15g/L、缓蚀剂2-8g/L,所述促进剂为硝酸钠、硝酸锌、硝酸钙、亚硝酸钠、氯酸钾、氯酸钠、高锰酸钾、钼酸钠、钼酸锰、过氧化氢中的一种或几种,所述络合剂为柠檬酸、酒石酸、EOTA、一种或几种,所述缓蚀剂为硫脲、六次甲基四胺一种或两种。经该工艺处理后的工件表面洁净致密,具有一定的绝缘电阻,可以明显提高后期涂覆有机涂层的有效接触面积,增强有机涂层附着力,从而有效提高钢构件的综合防腐性能。
Description
技术领域
本发明属于钢材防腐技术领域,涉及一种化学转化处理工艺,具体而言涉及钢构输变电设备涂覆有机涂层前化学转化工艺。
背景技术
变电站中有部分碳钢构件尺寸较大,难于进行热镀锌,常采用表面喷砂处理后喷涂或刷涂防腐涂料的方法代替镀锌层进行防腐。这类构件主要集中在变压器、设备构架、箱体和外壳上。采用涂料防腐主要是依靠物理屏蔽作用隔绝外界腐蚀介质与基体铁的接触,电化学保护性不如镀锌层。锌的电化学保护性体现在局部缺陷较小时,即使露出铁基体,也是周围的阳极金属锌先发生腐蚀,可较好地保护铁基体;而防腐涂料局部位置破损时,将形成孔隙积水吸潮,或发生膜下腐蚀,进而加快铁的腐蚀速度,并以缺陷为中心扩展,导致设备整体腐蚀。这种腐蚀类型占变电站的总体腐蚀破坏的近40%,给变电站设备正常服役和维护保养造成很大的困难。特别对于处于海洋环境及其附近陆地中的钢铁构件面临的腐蚀破坏要远比内陆地复杂得多,腐蚀破坏也最为严重。
发明内容
本发明的目的是针对生产的钢构件腐蚀与防护提供一种化学转化工艺,以提高钢构件涂覆有机涂层的有效接触面积,增强有机涂层的附着力,从而提升钢构件涂覆有机涂层后的综合防腐性能,最终实现长效防腐蚀的目的。
本发明通过如下的技术方案实现 :
一种钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:该工艺包含预处理→转化→水洗→干燥四个步骤:
第一,预处理:采用化学或机械方法除去待处理钢构件表面的油污、锈层及氧化皮等杂质;
第二,转化:将预处理后的钢构件放入60-70℃的化学转化液中处理15-25分钟;
第三,水洗:用60-80℃的自来水清洗转化处理后的钢构件表面;
第四,自然干燥或烘干;
所述转化过程所用的化学转化液由H3PO4、ZnO、MnH2PO4、促进剂、络合剂及缓蚀剂组成,其配比如下:
H3PO4 20-50 g/L
ZnO 10-20 g/L
MnH2PO4 10-15 g/L
促进剂 50-100g/L
络合剂 10-15g/L
缓蚀剂 2-8g/L。
所述化学转化液的游离酸度FA=2-7点,总酸度TA=50-70点。
所述促进剂为硝酸钠、硝酸锌、硝酸钙、亚硝酸钠、氯酸钾、氯酸钠、高锰酸钾、钼酸钠、钼酸锰、过氧化氢中的一种或几种。
所述络合剂为柠檬酸、酒石酸、EOTA中的一种或几种。
所述缓蚀剂为硫脲、六次甲基四胺中的一种或两种。
本发明具有如下优点:
1) 本发明可以有效提高涂层表面的附着力,当涂层表面有划伤、磕碰等损伤时等该膜层可以起到阻挡膜下金属腐蚀。
2)锌层表面转化成膜液属于环保型,不含铬酸盐,因而大大减轻了生产过程及产品对环境的污染。
3)本发明成本低、效率高,工艺稳定,操作方法简单工程施工方便,特别适合于对于大件或超大件的防腐,适用于工业应用。
具体实施方式
本发明公开了一种钢构输变电设备涂覆有机涂层前的化学转化工艺,其工艺过程包括去污除锈、转化处理、水洗及干燥四个过程。其中所述转化处理液的成分为H3PO4 20-50 g/L、ZnO 10-20 g/L、MnH2PO410-15 g/L、促进剂 50-100g/L、络合剂 10-15g/L、缓蚀剂 2-8g/L,所述促进剂为硝酸钠、硝酸锌、硝酸钙、亚硝酸钠、氯酸钾、氯酸钠、高锰酸钾、钼酸钠、钼酸锰、过氧化氢中的一种或几种,所述络合剂为柠檬酸、酒石酸、EOTA、一种或几种,所述缓蚀剂为硫脲、六次甲基四胺一种或两种。经该工艺处理后的工件表面洁净致密,具有一定的绝缘电阻,可以明显提高后期涂覆有机涂层的有效接触面积,增强有机涂层附着力,从而有效提高钢构件的综合防腐性能。
下面结合实施例,对本发明作进一步详细说明,但本发明的实施方式不限于此:
实施例1:
本实施例Q235号钢材为基体在其表面进行化学转化,包括以下步骤:
步骤1,预处理:机械方法如喷砂除去待处理钢构件表面的油污、锈层及氧化皮等杂质;
步骤2,转化:将预处理后的钢构件放入65℃的化学转化液中处理20分钟。化学转化液的成分如下:H3PO4 25 g/L、ZnO 16 g/L、MnH2PO4 13 g/L、NaNO3 20g/L、Na2MoO4 20g/L、MnMoO4 20g/L、柠檬酸 10g/L、硫脲 5g/L,该溶液游离酸度为4点,总酸度为52点。
步骤3,水洗:用65℃的自来水清洗转化处理后的钢构件表面;
步骤4,热风烘干。
最后根据国家电网公司企业标准Q/GDW 674-2011输电线路铁塔防护涂料选择标准,在已产生白色锌锈的镀锌钢板上采用本发明进行化学转化后再涂覆防腐涂层,涂层组成为铁红底漆,环氧云铁中间漆,丙烯酸面漆。
经此工艺处理的钢件表面化学转化膜层为深灰色至浅黑色,表面洁净致密,具有一定的绝缘电阻,明显提高有机涂层的有效接触面积,有机涂层附着力0级。经本工艺处理的钢构件涂有机涂层后其综合防腐性能可提高10倍。
实施例2:
本实施例Q235号钢材为基体在其表面进行化学转化,包括以下步骤:
步骤1,预处理:机械方法如喷砂除去待处理钢构件表面的油污、锈层及氧化皮等杂质;
步骤2,转化:将预处理后的钢构件放入60℃的化学转化液中处理25分钟。化学转化液的成分如下:H3PO4 30g/L、ZnO 13 g/L、MnH2PO410 g/L、硝酸钙 15g/L、氯酸钾 17g/L、高锰酸钾18g/L、过氧化氢6g/L、酒石酸 6g/L、EOTA 6g/L、六次甲基四胺 5g/L、硫脲 2g/L,该溶液游离酸度为6点,总酸度为61点。
步骤3,水洗:用60℃的自来水清洗转化处理后的钢构件表面;
步骤4,自然干燥。
经此工艺处理的钢件表面工件表面为深灰色至浅黑色,表面洁净致密,具有一定的绝缘电阻,明显提高有机涂层的有效接触面积,增强有机涂层附着力,经本工艺处理的钢构件涂有机涂层后其综合防腐性能可提高8倍。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何不经过创造性劳动想到的变化或替换,都应涵盖在本发明的保护范围之内。
Claims (5)
1.一种钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:该工艺包含预处理→转化→水洗→干燥四个步骤:
第一,预处理:采用化学或机械方法除去待处理钢构件表面的油污、锈层及氧化皮等杂质;
第二,转化:将预处理后的钢构件放入60-70℃的化学转化液中处理15-25分钟;
第三,水洗:用60-80℃的自来水清洗转化处理后的钢构件表面;
第四,自然干燥或烘干;
所述转化过程所用的化学转化液由H3PO4、ZnO、MnH2PO4、促进剂、络合剂及缓蚀剂组成,其配比如下:
H3PO4 20-50 g/L
ZnO 10-20 g/L
MnH2PO4 10-15 g/L
促进剂 50-100g/L
络合剂 10-15g/L
缓蚀剂 2-8g/L。
2.根据权利要求1所述的钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:所述化学转化液的游离酸度FA=2-7点,总酸度TA=50-70点。
3.根据权利要求1所述的钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:所述促进剂为硝酸钠、硝酸锌、硝酸钙、亚硝酸钠、氯酸钾、氯酸钠、高锰酸钾、钼酸钠、钼酸锰、过氧化氢中的一种或几种。
4.根据权利要求1所述的钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:所述络合剂为柠檬酸、酒石酸、EOTA中的一种或几种。
5.根据权利要求1所述的钢构输变电设备涂覆有机涂层前的化学转化工艺,其特征在于:所述缓蚀剂为硫脲、六次甲基四胺中的一种或两种。
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Cited By (5)
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CN105483681A (zh) * | 2015-12-10 | 2016-04-13 | 董晓娜 | 一种锌系金属处理液的制备方法 |
CN105483682A (zh) * | 2015-12-10 | 2016-04-13 | 董晓娜 | 一种用于金属处理的磷化液及其制备方法 |
CN105543828A (zh) * | 2015-12-21 | 2016-05-04 | 国家电网公司 | 一种输变电设备用活性锈层转锈剂及其制备方法和应用 |
CN107345297A (zh) * | 2015-12-10 | 2017-11-14 | 董晓娜 | 一种碱性清洗液、磷化液及金属表面处理方法 |
CN109385213A (zh) * | 2018-09-18 | 2019-02-26 | 金华市鸿新新材料科技有限公司 | 一种适用于水性漆的环保无磷前处理液及其制备与应用 |
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CN101029386A (zh) * | 2007-04-09 | 2007-09-05 | 湖南大学 | 用于钢板及镀锌板处理的含钙锌锰三元阳离子磷化液 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105483681A (zh) * | 2015-12-10 | 2016-04-13 | 董晓娜 | 一种锌系金属处理液的制备方法 |
CN105483682A (zh) * | 2015-12-10 | 2016-04-13 | 董晓娜 | 一种用于金属处理的磷化液及其制备方法 |
CN107345297A (zh) * | 2015-12-10 | 2017-11-14 | 董晓娜 | 一种碱性清洗液、磷化液及金属表面处理方法 |
CN107345297B (zh) * | 2015-12-10 | 2020-07-14 | 威海赤那思电子材料有限公司 | 一种碱性清洗液、磷化液及金属表面处理方法 |
CN105543828A (zh) * | 2015-12-21 | 2016-05-04 | 国家电网公司 | 一种输变电设备用活性锈层转锈剂及其制备方法和应用 |
CN109385213A (zh) * | 2018-09-18 | 2019-02-26 | 金华市鸿新新材料科技有限公司 | 一种适用于水性漆的环保无磷前处理液及其制备与应用 |
CN109385213B (zh) * | 2018-09-18 | 2021-02-09 | 金华市鸿新新材料科技有限公司 | 一种适用于水性漆的环保无磷前处理液及其制备与应用 |
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