CN109030397B - 一种冷硬卷板面残油含量的检验方法 - Google Patents

一种冷硬卷板面残油含量的检验方法 Download PDF

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CN109030397B
CN109030397B CN201810905867.XA CN201810905867A CN109030397B CN 109030397 B CN109030397 B CN 109030397B CN 201810905867 A CN201810905867 A CN 201810905867A CN 109030397 B CN109030397 B CN 109030397B
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益胜光
魏龙峰
曹海霞
贾红国
马金川
刘云波
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Abstract

本发明属于冷硬卷板检验技术领域,具体涉及到一种冷硬卷板面残油含量的检验方法,采用有机试剂做为溶剂清洗板面残油,清洗方法快捷干净,利用分光光度法检出溶剂中残油含量,再通过数据换算得出板面残油含量,准确度更高,操作更简单,耗时更短。

Description

一种冷硬卷板面残油含量的检验方法
技术领域
本发明属于冷硬卷板检验技术领域,具体涉及到一种冷硬卷板面残油含量的检验方法。
背景技术
冷硬卷板面残油含量直接影响了轧制油油耗和冷硬卷板质量,冷硬卷板面残油含量过高、冷硬卷板油污重,不仅会增加生产成本,还增加了下游工序镀锌清洗难度,容易导致漏镀、脱锌等质量问题。目前检验冷硬卷板面残油含量主要方法是“重量法”,此方法用脱脂棉擦拭冷硬卷板面残油,通过前后重量差,换算出板面残油含量,由于用脱脂棉擦拭去除残油时很难判断残油是否清除干净,因此误差极大,再加之重量法需要烘干进行称重,耗时较长。
发明内容
本发明为解决现有技术的不足,提供一种冷硬卷板面残油含量的检验方法。
本发明是通过以下技术方案实现的:一种冷硬卷板面残油含量的检验方法,包括如下步骤:
(1)提取板面残油:采用真空旋转蒸发器提取任一冷硬卷板上残留乳化液中的轧制油,即冷硬卷板的板面残油;
(2)检测板面残油波长:以石油醚为溶剂,提取的板面残油为溶质,配制成500mg/L的溶液,用紫外分光光度计扫描检测出板面残油波长,记为Bnm;
(3)建立板面残油标准曲线:以石油醚为溶剂,提取的板面残油为溶质,分别配制6个浓度的标准溶液,其中包括浓度为0mg/L的标准溶液,其余5个标准溶液的浓度值在此基础上逐渐递增,然后用紫外分光光度计在Bnm波长下,分别测定上述6个标准溶液的吸光度,并建立板面残油标准曲线,板面残油标准曲线以标准溶液的浓度(mg/L)为横坐标,测出的吸光度(Abs)为纵坐标,且板面残油标准曲线相关系数R值达到三个9要求,标准曲线才为合格,才能为下面步骤应用;
(4)样品处理:分别在冷硬卷板的传动侧、中间和操作侧剪取同样大小的三块钢板,三块钢板的单面的面积记为Sm2,分别将三块钢板放入三个器皿中,并分别加入DmL石油醚作为清洗剂,加入的石油醚量至少能全部溶解钢板上的板面残油,浸泡30分钟,中间间歇震荡、摇晃器皿,使板面残油充分溶解到石油醚中,分别记作样品Ⅰ、Ⅱ、Ⅲ;
(5)样品浓度测定:在波长Bnm下,用紫外分光光度计分别测出样品Ⅰ、Ⅱ、Ⅲ的吸光度,并在板面残油标准曲线上找出样品Ⅰ、Ⅱ、Ⅲ对应的板面残油浓度,找出的板面残油浓度记为Cmg/L;
(6)板面残油含量计算:通过下面式子计算板面残油含量:
其中,Y表示板面残油含量,单位mg/m2
D表示步骤(4)中加入的石油醚体积,单位mL;
C表示板面残油浓度,单位mg/L;
S表示步骤(4)中剪取的钢板的单面面积,单位m2;2S为钢板两面的面积。
优选的,在步骤(4)中,剪取的钢板大小为长100mm,宽100mm,在器皿中加入50mL石油醚作为清洗剂。
本发明的有益效果为:方法操作简便 、快捷 、误差小,与传统重量法相比,解决了现有检测方法误差大、耗时长的问题。
附图说明
图1为本发明实施例测试建立的板面残油标准曲线图。
具体实施方式
以下给出本发明的具体实施例,需要说明的是本发明并不局限于以下具体实施例,凡在本申请技术方案基础上做的等同变换均落入本发明的保护范围。
一种冷硬卷板面残油含量的检验方法,包括如下步骤:
(1)提取板面残油
冷硬卷板在生产过程中通过乳化液润滑冷却,乳化液为轧制油与水按一定比例配制而成,冷轧后在冷硬卷板板面上会残留乳化液。采用真空旋转蒸发器提取任一冷硬卷板上残留乳化液中的轧制油,即冷硬卷板的板面残油。真空旋转蒸发器及用它提取乳化液中的轧制油为常用公知技术,这里不再对其原理、方法进行赘述;
(2)检测板面残油波长
以石油醚为溶剂,提取的板面残油为溶质,配制成500mg/L的溶液,用紫外分光光度计扫描检测出板面残油波长,记为Bnm;
本实施例测出的板面残油波长为268nm;
(3)建立板面残油标准曲线
以石油醚为溶剂,提取的板面残油为溶质,分别配制6个浓度的标准溶液,其中包括浓度为0mg/L的标准溶液,其余5个标准溶液的浓度值在此基础上逐渐递增,比如:分别配制0mg/L、53mg/L、105mg/L、159mg/L、212mg/L、405mg/L的标准溶液,然后用紫外分光光度计在Bnm波长下,测定上述6个标准溶液的吸光度,并建立板面残油标准曲线,板面残油标准曲线以标准溶液的浓度(mg/L)为横坐标,测出的吸光度(Abs)为纵坐标,且板面残油标准曲线相关系数R值达到三个9要求,板面残油标准曲线才为合格,才能为下面步骤应用,比如R值为0.9990,即达到三个9要求,R值由紫外分光光度计自动计算得出,为仪器自带功能,这里不再过多叙述;
本实施例配制的6个浓度的标准溶液分别为:0mg/L 、100mg/L、200mg/L、300mg/L、400mg/L、500mg/L,然后用紫外分光光度计在268nm波长下,分别测定上述标准溶液的吸光度,建立板面残油标准曲线,如附图1所示,附图1为测试的板面残油标准曲线图,其中建立的板面残油标准曲线的R值为0.9998,为仪器自动计算得出,因此此板面残油标准曲线图可以为下面测试步骤使用。
(4)样品处理
分别在冷硬卷板的传动侧、中间和操作侧剪取同样大小的三块钢板,三块钢板的单面的面积记为Sm2,分别将三块钢板放入三个同样的器皿中,并均加入DmL石油醚作为清洗剂,石油醚同时也是溶剂,加入的DmL石油醚量至少要能全部溶解钢板上的板面残油,浸泡30分钟,中间间歇震荡、摇晃器皿,加速板面残油的溶解,使板面残油充分溶解到石油醚中,这样得到三份以DmL石油醚为溶剂、板面残油为溶质的溶液,分别记作样品Ⅰ、Ⅱ、Ⅲ;
本实施例中剪取的钢板大小为长100mm,宽100mm,钢板的单面面积为0.01m2,在器皿中加入50mL石油醚作为清洗剂;
(5)样品浓度测定
在波长Bnm下,用紫外分光光度计分别测出样品Ⅰ、Ⅱ、Ⅲ的吸光度,并在板面残油标准曲线上找出样品Ⅰ、Ⅱ、Ⅲ对应的板面残油浓度,找出的板面残油浓度记为Cmg/L;
本实施例在波长268nm下,用紫外分光光度计分别测出样品Ⅰ、Ⅱ、Ⅲ的吸光度,然后根据测出的样品Ⅰ、Ⅱ、Ⅲ的吸光度在步骤(3)中建立的板面残油标准曲线上找到样品Ⅰ、Ⅱ、Ⅲ对应的板面残油浓度分别为121.1mg/L、75.8mg/L、69.2mg/L,即传动侧板面残油浓度为121.1mg/L,中间的板面残油浓度为75.8mg/L,操作侧板面残油浓度为69.2mg/L;
(6)板面残油含量计算
通过下面式子计算板面残油含量:
其中,Y表示板面残油含量,单位mg/m2
D表示步骤(4)中加入的石油醚体积,单位mL;
C表示板面残油浓度,单位mg/L;
S表示步骤(4)中钢板的单面面积,单位m2;2S为钢板的上、下表面的面积;
根据上述式子分别计算传动侧、中间和操作侧的板面残油含量。
本实施例中,将上述步骤中的数据代入上述式子,计算出冷硬卷板传动侧板面残油含量为302.8mg/m2;中间板面残油含量为189.5mg/m2;操作侧板面残油含量为176mg/m2
以上所述的实施例,只是本发明较优选的具体实施方式的一种,本领域的技术人员在本发明技术方案范围内进行的通常变化和替换都应包含在本发明的保护范围内。

Claims (1)

1.一种冷硬卷板面残油含量的检验方法,其特征在于:包括如下步骤:
(1)提取板面残油:采用真空旋转蒸发器提取任一冷硬卷板上残留乳化液中的轧制油,即冷硬卷板的板面残油;
(2)检测板面残油波长:以石油醚为溶剂,提取的板面残油为溶质,配制成500mg/L的溶液,用紫外分光光度计扫描检测出板面残油波长,记为Bnm;
(3)建立板面残油标准曲线:以石油醚为溶剂,提取的板面残油为溶质,分别配制6个浓度的标准溶液,其中包括浓度为0mg/L的标准溶液,其余5个标准溶液的浓度值在此基础上逐渐递增,然后用紫外分光光度计在Bnm波长下,分别测定上述6个标准溶液的吸光度,并建立板面残油标准曲线,板面残油标准曲线以标准溶液的浓度为横坐标,浓度单位mg/L,测出的吸光度为纵坐标,吸光度单位Abs,且板面残油标准曲线相关系数R值达到三个9要求,标准曲线才为合格,才能为下面步骤应用;
(4)样品处理:分别在冷硬卷板的传动侧、中间和操作侧剪取同样大小的三块钢板,三块钢板的单面的面积记为Sm2,其中钢板的长100mm,宽100mm;分别将三块钢板放入三个器皿中,并分别加入DmL石油醚作为清洗剂,加入的石油醚量至少能全部溶解钢板上的板面残油,其中D为50;浸泡30分钟,中间间歇震荡、摇晃器皿,使板面残油充分溶解到石油醚中,分别记作样品Ⅰ、Ⅱ、Ⅲ;
(5)样品浓度测定:在波长Bnm下,用紫外分光光度计分别测出样品Ⅰ、Ⅱ、Ⅲ的吸光度,并在板面残油标准曲线上找出样品Ⅰ、Ⅱ、Ⅲ对应的板面残油浓度,找出的板面残油浓度记为Cmg/L;
(6)板面残油含量计算:通过下面式子计算板面残油含量:
其中,Y表示板面残油含量,单位mg/m2
D表示步骤(4)中加入的石油醚体积,单位mL;
C表示板面残油浓度,单位mg/L;
S表示步骤(4)中剪取的钢板的单面面积,单位m2;2S为钢板上、下表面的面积。
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Denomination of invention: A test method for residual oil content of cold and hard coil surface

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Denomination of invention: A test method for residual oil content of cold hardening coil surface

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Denomination of invention: A method for testing the residual oil content on the surface of a cold hard coil

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