蜂窝状表面热轧酸洗钢板磷化前处理性能研究

龙 袁, 颜晨曦, 郝玉林, 齐志坤, 刘华赛, 李学涛

doi:10.16577/j.issn.1001-1560.2023.0008

材料保护 >

2023 , Vol. 56 >Issue 1: 50 - 57

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0008

试验研究

蜂窝状表面热轧酸洗钢板磷化前处理性能研究

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1. 首钢集团有限公司技术研究院，北京 100043； 2. 绿色可循环钢铁流程北京市重点实验室，北京 100043

龙袁(1990-)，硕士，中级工程师，主要研究方向为汽车板涂装与腐蚀，E-mail:longyuan.shougang＠qq.com

收稿日期: 2022-07-25

修回日期: 2022-08-09

录用日期: 2022-09-21

网络出版日期: 2023-07-25

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Study on Phosphating Pretreatment Properties of Hot-Rolled Pickling Steel Plate with Honeycomb Surface Morphology

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1. Technology Research Institute of Shougang Group Co.， Ltd.， Beijing 100043， China；2. Beijing Key Laboratory of Green Recyclable Process for Iron ＆ Steel Production Technology， Beijing 100043， China

Received date: 2022-07-25

Revised date: 2022-08-09

Accepted date: 2022-09-21

Online published: 2023-07-25

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摘要

为了研究热轧酸洗板蜂窝状表面对其磷化性能的影响、分析蜂窝状表面形成的原因以及蜂窝状表面影响磷化膜生长的机理，通过在蜂窝状钢板表面制备磷化膜，使用辉光光谱仪、粗糙度测试仪分析钢板表面元素分布以及表面粗糙度，采用扫描电镜观察钢板表面形貌及磷化膜形貌，通过X 射线衍射仪分析磷化膜P 比，使用电化学工作站分析磷化膜耐蚀性能以及蜂窝状表面钢板在磷化液中的活性。结果表明:酸洗板的蜂窝状表面导致磷化膜覆盖率小于100%，磷化膜P 比为70.1%，阻抗为1.6×104 Ω·cm2，自腐蚀电位在-0.61 V 左右，自腐蚀电流密度在10 μA/cm2，各项性能均比典型形貌酸洗板表面磷化质量要差。通过含Cl-硅藻泥模拟实验，确定蜂窝状微观形貌是Cl-过度侵蚀钢板表面导致的。蜂窝表面钢板经过表调处理后在磷化液中的开路电位明显正移，反应活性降低，是由于蜂窝状微观结构在经过表调处理后残留表调液，阻碍磷化液与钢板接触，减缓钢板溶解过程，导致钢板表面Fe2+浓度偏低，抑制了Fe2+、Zn2+与磷酸根离子在钢板表面形成磷化膜，从而导致蜂窝状酸洗板表面磷化膜覆盖率不足。因此蜂窝状表面不利于磷化膜生长，需要控制酸洗工艺稳定性，对预漂洗流量参数、挤干辊、漂洗槽及漂洗喷嘴设备定期检查，避免酸洗板出现蜂窝状表面。

关键词： 热轧; 酸洗板; 蜂窝; 前处理; 磷化

本文引用格式

龙袁, 颜晨曦, 郝玉林, 齐志坤, 刘华赛, 李学涛 . 蜂窝状表面热轧酸洗钢板磷化前处理性能研究[J]. 材料保护, 2023 , 56(1) : 50 -57 . DOI: 10.16577/j.issn.1001-1560.2023.0008

Abstract

In order to study the effect of honeycomb surface on the phosphating properties of hot-rolled pickling plate， and to analyze the reasons for the formation of honeycomb surface as well as the mechanism for the honeycomb surface to influence the growth of phosphating film， a phosphating film was prepared on the honeycomb surface of steel plate. Glow spectrometer and roughness tester were used to analyze the surface element distribution and the roughness of steel plate surface. Scanning electron microscope was used to observe the morphology of the steel plate surface and phosphating film. X-ray diffraction was used to analyze the P ratio of phosphating film. And the electrochemical workstation was used to study the corrosion resistance of phosphating film and the activity of steel plate with honeycomb surface in phosphating solution. Results showed that on the honeycomb surface of pickling plate， the phosphorization film coverage rate was less than 100%， the P ratio of phosphorization film was 70.1%， the impedance was 1.6×104 Ω·cm2， the self-corrosion potential was about -0.61 V， the self-corrosion current was 10 μA/cm2， and all the properties were worse than those of the phosphating film having typical surface morphology. Through the simulation experiment of diatom mud containing Cl-，it was confirmed that the honeycomb morphology was caused by excessive erosion of Cl-. After surface conditioning treatment， the open-circuit potential of steel plate with honeycomb surface in the phosphating solution shifted positively significantly，and the reaction activity was reduced. The reason was that the surface conditioning solution left in the honeycomb microstructure after surface conditioning treatment prevented the phosphating solution from contacting with the steel plate， slowed down the dissolution process of the steel plate， resulting in a low concentration of Fe2+ on the surface of the steel plate， and thus inhibited the Fe2+， Zn2+ and phosphate ions from forming phosphating film on the surface of the steel plate. As a result， the coverage rate of phosphating film on the honeycomb surface of pickling plate was insufficient. Therefore，the honeycomb surface was not conducive to the growth of the phosphating film. So，it was necessary to control the stability of the pickling process and check the pre-rinsing flow parameters，drying roller，rinsing tank and rinsing nozzle equipment regularly to avoid honeycomb surface of the pickling plate.

Key words： hot rolling; pickling plate; honeycomb; pre-treatment; phosphating

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