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Journal of Sol-Gel Science and Technology

, Volume 89, Issue 2, pp 403–415 | Cite as

The influence of curing agents on thermal property and corrosion resistance of chemically bonded phosphate ceramic coatings

  • Yaxuan Liu
  • Da Bian
  • Yongwu ZhaoEmail author
Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • 79 Downloads

Abstract

The curing agents play an important role on the properties of the chemically bonded phosphate ceramic coatings (CBPCs). To investigate the influence of curing agents on the thermal property and corrosion resistance of CBPCs, the coatings with different curing agents were prepared on the mild steel (Q235). The analysis of thermal property and phase characterization shows that the high peak temperature of curing decreases with the introduction of curing agents, and the weight ratio of AlPO4 to α-Al2O3 (RAA) of the coatings is also influenced by curing agents resulted by the high heat release from MgO, CaO, and ZnO-related reactions. In addition, the results of scanning electron microscopy (SEM) and electrochemical experiments reveal that the bonding strength among the ceramic particles and the defects content of the coatings, which affects the inhibition properties of CBPCs have a relationship with the value of RAA. Typically, the impedance value of CBPC with the best curing agent (MgO) are around 40,000 ohm cm2, which is 4624 times larger than that of the bare mild steel (8.65 ohm cm2).

Highlights

  • The effect of curing agents on thermal property and corrosion inhibition of CBPCs was studied.

  • The high curing temperature decreases with the introduction of curing agents.

  • The CBPCs with MgO agent possess the lowest curing temperature.

  • The AlPO4 to α-Al2O3 weight ratio affects bonding strength, defects, and corrosion resistance of CBPCs.

Keywords

Phosphate ceramic coatings Sol-gel preparation Inorganic curing agent Thermal property Corrosion resistance Mild steel 

Notes

Acknowledgements

The authors wish to express appreciation for the financial support of the National Natural Science Foundation of China (grant no. 51675232), Postgraduate Research & Practice Innovation Program of Jiangsu Provence (grant no. KYCX18_1842), the Fundamental Research Funds for the Central Universities (grant no. JUSRP51729A), the Mechanical Engineering Discipline Construction Funds of Jiangnan university (grant no. 10752103721800101007) and the national first-class discipline program of Light Industry Technology and Engineering (LITE2018-29).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Mechanical EngineeringJiangnan UniversityWuxiChina

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