封闭处理对建筑结构钢锌系磷酸盐转化膜性能的影响

doi:10.19964/j.issn.1006-4990.2020-0606

Abstract

Abstract:

Zinc phosphate conversion film was prepared on building structural steel,and it was sealed with different types of sealing solution.The effect of sealing treatment on the microstructure,surface components,thickness and corrosion resistance of phosphate conversion film were studied.The results showed that sealing treatment had no significant influence on the macrostructure and thickness of phosphate conversion film,but there were some differences in the microstructure,surface components and corrosion resistance of phosphate conversion film.The surface components of unsealed and sealed phosphate conversion film were mainly Zn,O and P.After sealing treatment,the surface of phosphate conversion film tended to be flat,the compactness was improved,and the corrosion resistance was significantly improved,which was mainly attributed to that different types of sealing solution play a role in filling the grain gaps and preventing the corrosive medium from penetrating into the phosphate conversion film.The phosphate conversion film sealed with the sealing solution containing sodium silicate and cerium nitrate had smoother surface,the solution resistance and charge transfer resistance were the biggest,which was 58.2 Ω·cm ² and 4.02×10³ Ω·cm ² respectively,and it had the greatest phase angle and the widest range of frequency.This phosphating film exhibited excellent corrosion resistance and ideal corrosion durability with application potential,and was expected to be used as the surface protection layer for building structural steel.

Key words: zinc phosphate conversion film, building structural steel, sealing treatment, microstructure, surface components, corrosion resistance

CLC Number:

TQ126.35

Wang Danjing,Li Jingkui. Effect of sealing treatment on properties of zinc phosphate conversion film on building structural steel[J]. Inorganic Chemicals Industry, 2021, 53(10): 92-97.

Figures/Tables 11

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References 18

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试剂	质量浓度/（g·L^-1）	试剂	质量浓度/（g·L^-1）
氧化锌	28~32	磷酸	6~10
硝酸	8.5~14	氯酸钠	1.5~2.5

类型	成分	工艺条件
封闭液1	铬酸盐20 g/L	70 ℃,10 min
封闭液2	硅酸钠14 g/L	80 ℃,10 min
封闭液3	硅酸钠14 g/L,硝酸铈50 mg/L	80 ℃,10 min

物质	元素质量分数/%
物质	Zn	O	P	Cr	C	Na	Si
USPCF	38.06	37.66	13.57	—	10.71	—	—
SPCF-1	38.12	37.79	13.39	1.47	9.23	—	—
SPCF-2	38.24	37.86	14.20	—	5.51	3.05	1.14
SPCF-3	38.22	37.80	13.97	—	4.87	3.81	1.33

物质	R_s/（Ω·cm²）	R_ct /（Ω·cm²）
USPCF	28.2	1.41×10³
SPCF-1	49.1	2.98×10³
SPCF-2	43.5	2.46×10³
SPCF-3	58.2	4.02×10³

浸泡时间/h	腐蚀情况
浸泡时间/h	USPCF	SPCF-1	SPCF-2	SPCF-3
12	未腐蚀,黑灰色	未腐蚀,黑灰色	未腐蚀,黑灰色	未腐蚀,黑灰色
36	轻度腐蚀,局部呈黄褐色	出现腐蚀迹象	出现腐蚀迹象	未腐蚀,黑灰色
60	腐蚀程度加重,腐蚀面积约占20%	出现腐蚀迹象	轻度腐蚀, 局部呈黄褐色	未腐蚀,黑灰色
84	腐蚀较严重,腐蚀面积接近30%	轻度腐蚀,腐蚀面积约占10%	腐蚀程度加重,腐蚀面积接近20%	轻度腐蚀, 局部呈黄褐色
120	腐蚀很严重,腐蚀面积超过50%	腐蚀程度加重, 腐蚀面积超过 20%	腐蚀较严重,腐蚀面积超过30%	轻度腐蚀, 腐蚀面积超过10%

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of sealing treatment on properties of zinc phosphate conversion film on building structural steel

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