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The aim of this paper is to investigate the synergism effect between lanthanum salt (La(NO₃)₃) and benzotriazole (BTAH) on the corrosion inhibition of commercial brass and to further study the inhibition mechanism.

Potentiodynamic polarization curves were carried out on bare brass and brass treated with additions of optimum concentration of BTAH, La salt and La salt+BTAH to the basal deposition solutions in 3.5 wt. percent sodium chloride solution. The inhibition mechanism of the composite conversion coatings on brass obtained in optimal deposition techniques were investigated by electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), X‐ray diffraction (XRD), and FT‐IR reflection spectra.

A “Critical La(NO₃)₃ content” and “Critical BTAH content” were both observed, at which the coatings prepared performs the highest protectiveness, and La(NO₃)₃ and BTAH had an excellent synergism effect on the corrosion inhibition of brass. The corrosion mechanisms for uncoated and coated brass are different. A remarkable enhancement of the brass's corrosion protection was obtained by the formation of composite conversion coatings consisted of Cu(I)BTA and La coordinate thing except for Cu₂O and La₂O₃, which acted as a barrier avoiding the release of metal ions and inhibited the diffusion of the oxygen.

The results from this paper showed that La(NO₃)₃ and BTAH could be used together to prepare the novel composited conversion coatings on commercial brass for the good corrosion inhibition.

This study aims to analyze Chinese and Western visitors’ on‐line reviews of Shenzhen under five dimensions: catering, accommodation, transportation, travel and shopping.

This study used a multidimensional discourse analysis to assess visitors’ experience, perception and emotional evaluations of Shenzhen in reviews on TripAdvisor.com.

The findings suggest that both Chinese and Western visitors show positive perceptions of Shenzhen’s transportation convenience and options and show great interest in folk culture. Both groups focus on shopping, service and price but believe that the prices in Shenzhen are high.

The classification of reviews highlights tourism elements in Shenzhen, which can offer implications for destination image formation for similar destinations.

This study offers suggestions on how to build an appealing destination that meets both Chinese and Western tourists’ needs.

This study enriches the theory of tourism image perception of Shenzhen as it relates to language and culture.

This study offers implications on building an appealing destination that meets Chinese and Western tourists’ expectations.

深圳目的地形象感知：基于中西方游客在线评论的话语分析

摘要

本研究从餐饮、住宿、交通、旅游、购物五个维度分析中西方游客对深圳的评价。

本研究采用多维语篇分析来评估访问者对深圳的体验、感知和情感评价。

调查结果表明, 中国和西方游客对深圳的交通便利和选择都表现出积极的看法, 并对民俗文化表现出浓厚的兴趣。两组都关注购物、服务和价格, 但认为深圳的物价偏高。

评论的分类突出了深圳的旅游元素，可以为相似目的地形象的构建提供启示。

本研究丰富了深圳旅游形象感知与语言相关的理论。它为建设一个满足中国和西方游客期望的吸引人的目的地提供了启示。

旅游目的地形象, 话语分析, 深圳, 多维话语分析, 中西方游客

文章类型： 研究型论文