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Article
Publication date: 28 August 2021

Zhe Li, Hongpeng Zheng, Li Liu, Fandi Meng, Yu Cui and Fuhui Wang

The purpose of this paper is to investigate the effect of urea–formaldehyde (UF) nanoparticles on the barrier property and delamination resistance for epoxy coating in a…

Abstract

Purpose

The purpose of this paper is to investigate the effect of urea–formaldehyde (UF) nanoparticles on the barrier property and delamination resistance for epoxy coating in a 3.5% NaCl aqueous solution.

Design/methodology/approach

The UF resin was synthesized via sol–gel method, and UF/epoxy composite coating was prepared through ball-milling process; the microstructure and chemical composition of UF resin were observed using the Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy; the bonding strength of coating/metal interface was investigated through adhesion test; the mechanical properties of the coatings were studied by tensile tests; and the barrier and corrosion resistance properties were verified using salt spray test, cathodic delamination test and electrochemical impedance spectroscopy measurements.

Findings

The experimental results indicated that the UF resin presented uniformly dispersed nanoparticles in the epoxy matrix and enhanced the bonding strength of coating/metal interface and then improved the delamination resistance for composite coating, which resulted in the enhancement of the barrier property and corrosion resistance for UF/epoxy composite coating.

Originality/value

In this paper, an easily prepared blending compounding coating with excellent corrosion resistance property was synthesized via sol–gel method and ball-milling process. The effects of UF nanoparticles on the barrier property and delamination resistance were investigated in detail.

Details

Anti-Corrosion Methods and Materials, vol. 68 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 13 September 2011

Shengnan Hu, Tao Zhang, Yawei Shao, Guozhe Meng and Fuhui Wanga

The purpose of this paper is to study the effect of cyclic hydrostatic pressure on the protective performance of cathodic protection (CP) system consisting of Zn‐Bi…

Abstract

Purpose

The purpose of this paper is to study the effect of cyclic hydrostatic pressure on the protective performance of cathodic protection (CP) system consisting of Zn‐Bi sacrificial anode and Ni‐Cr‐Mo‐V steel.

Design/methodology/approach

The anode and cathode polarization curves of the driving potential and current for CP were investigated in case of cyclic hydrostatic pressure (0‐3.5 MPa) and compared with that at atmospheric pressure. The morphologies of the anode material with and without corrosion products were observed by scanning electron microscopy.

Findings

The experimental results revealed that the cyclic hydrostatic pressure had significant influence on the CP system. The anode potential instantaneously responded to the cyclic hydrostatic pressure and the discharge performance decreased due to the deposition of corrosion product. Also, the CP system exhibited higher slope parameter under cyclic hydrostatic pressure, indicating that the CP system cannot provide adequate protection for Ni‐Cr‐Mo‐V steel.

Originality/value

The results presented in this paper clearly show the effect of cyclic hydrostatic pressure on the sacrificial anode CP system, and present a foundation for further research on the practical application of sacrificial anode under cyclic hydrostatic pressure environment.

Details

Anti-Corrosion Methods and Materials, vol. 58 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 8 May 2009

Zhimin Zhou

The purpose of this paper is to explore key factors driving four types of brand relationships, which will explain the reasons why different relationships can form in…

Abstract

Purpose

The purpose of this paper is to explore key factors driving four types of brand relationships, which will explain the reasons why different relationships can form in theory and direct brand managers to build brand relationships in practice.

Design/methodology/approach

A sample of 702 data was collected through four branch scales. The empirical methods of exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were used in turn to extract the key factors driving every kind of brand relationships.

Findings

The conclusion is that the established instrument relationships are driven by three factors which are: sociogroup pressure, condition restriction and saving the existing; the established emotion relationships are driven by four factors which are company reputation, approval of geography, approval of authority and word of mouth; the acquired instrument relationships are driven by three factors which are low price, brand homogeneity and attempt on new products: and the acquired emotion relationships are driven by six factors which are brand meaning, the staffs' service, marketing promotion, product design, product value and brand element.

Research limitations/implications

There were three limitations in this research. First, the limitation of the sample structure decided this research as an exploratory one. Second, this research only adopted a static perspective although a relationship is a dynamic concept. Third, a few items were not drawn up appropriately so that the fitness of a few models was not perfect.

Originality/value

The formation mechanisms of different brand relationships have not been entirely explored in the former literatures. Based on a new sortation theory of four brand relationships in China, this research exploratorily put forward the completed key factors driving every kind of relationships.

Details

Journal of Chinese Entrepreneurship, vol. 1 no. 2
Type: Research Article
ISSN: 1756-1396

Keywords

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