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Article
Publication date: 1 March 1974

C.J. KORPICS

The need for protective films which aid in retention of newly fabricated surfaces of copper and copper alloys is generally recognized. Two commercially available aromatic…

Abstract

The need for protective films which aid in retention of newly fabricated surfaces of copper and copper alloys is generally recognized. Two commercially available aromatic triazoles function as unique corrosion inhibitors particularly of copper and copper alloys. Benzotriazole and tolyltriazole, which are manufactured by Sherwin Williams Chemicals, a Division of The Sherwin‐Williams Company, are known by the trademarked names of CobratecR 99 and CobratecR TT‐100, respectively. The chemical structures of these compounds, which are shown in Figure 1, have essentially the same functioral characteristics. Use of tolyltriazole is favoured for many applications because of economic considerations.

Details

Anti-Corrosion Methods and Materials, vol. 21 no. 3
Type: Research Article
ISSN: 0003-5599

Article
Publication date: 1 December 2000

A.N. Önal and A.A. Aksüt

The effect of tolyltriazole (TTA) on the corrosion of Al‐Cu, Al‐Si‐Cu and Al‐Cu‐Fe alloys in HCl (pH = 0.5) and NaCl (pH = 6 and 11) respectively at 15C, 25C and 35C has been…

Abstract

The effect of tolyltriazole (TTA) on the corrosion of Al‐Cu, Al‐Si‐Cu and Al‐Cu‐Fe alloys in HCl (pH = 0.5) and NaCl (pH = 6 and 11) respectively at 15C, 25C and 35C has been studied by electrochemical methods. Corrosion potentials, corrosion rates, polarization resistances, inhibition efficiencies and activation energies have been determined. The results have shown that the inhibition efficiencies of TTA changed with pH and temperature. TTA has been adsorbed on the alloys to form Cu(I)‐TTA film. TTA was more efficient at pH = 0.5 and 6 than at pH = 11. Increasing the temperature from 15C to 35C decreased the inhibition effect of TTA.

Details

Anti-Corrosion Methods and Materials, vol. 47 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 April 2005

D.M. Bastidas, E. Cano and E.M. Mora

To provide a selective bibliography for graduate students and new faculty members with sources which can help them develop their academic career.

2630

Abstract

Purpose

To provide a selective bibliography for graduate students and new faculty members with sources which can help them develop their academic career.

Design/methodology/approach

A range of published (1951‐2004) works, which aim to discuss the main parameters of the volatile corrosion inhibition process. The sources are sorted into sections: transport of the volatile corrosion inhibitor (VCI) to the metallic surface, vapour pressure of a VCI, dependence of vapour pressure upon temperature, effect of pH on VCI behaviour, formation and destruction of adsorbed films, and volatile corrosion inhibitor monitors (VCIM).

Findings

Provides information about each source, indicating what can be found there and how the information can help. Recognises the lack of real training of many academics before they are expected to take on teaching/researching duties and finds some texts which help.

Research limitations/implications

It is not an exhaustive list and apart from several UK and US books all the rest are EU and US publications which perhaps limits its usefulness elsewhere.

Practical implications

A very useful list of the most common compounds used as VCIs is reported.

Originality/value

This paper fulfils an identified information/resources need and offers practical help to an individual starting out on and academic career and to professional with some experience on corrosion inhibition.

Details

Anti-Corrosion Methods and Materials, vol. 52 no. 2
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 7 September 2021

Yang Liu, Yi Chen, Kefan Xie and Jia Liu

This research aims to figure out whether the pool testing method of SARS-CoV-2 for COVID-19 is effective and the optimal sample size is in one bunch. Additionally, since the…

Abstract

Purpose

This research aims to figure out whether the pool testing method of SARS-CoV-2 for COVID-19 is effective and the optimal sample size is in one bunch. Additionally, since the infection rate was unknown at the beginning, this research aims to propose a multiple sampling approach that enables the pool testing method to be utilized successfully.

Design/methodology/approach

The authors verify that the pool testing method of SARS-CoV-2 for COVID-19 is effective under the situation of the shortage of nucleic acid detection kits based on probabilistic modeling. In this method, the testing is performed on several samples of the cases together as a bunch. If the test result of the bunch is negative, then it is shown that none of the cases in the bunch has been infected with the novel coronavirus. On the contrary, if the test result of the bunch is positive, then the samples are tested one by one to confirm which cases are infected.

Findings

If the infection rate is extremely low, while the same number of detection kits is used, the expected number of cases that can be tested by the pool testing method is far more than that by the one-by-one testing method. The pool testing method is effective only when the infection rate is less than 0.3078. The higher the infection rate, the smaller the optimal sample size in one bunch. If N samples are tested by the pool testing method, while the sample size in one bunch is G, the number of detection kits required is in the interval (N/G, N).

Originality/value

This research proves that the pool testing method is not only suitable for the situation of the shortage of detection kits but also the situation of the overall or sampling detection for a large population. More importantly, it calculates the optimal sample size in one bunch corresponding to different infection rates. Additionally, a multiple sampling approach is proposed. In this approach, the whole testing process is divided into several rounds in which the sample sizes in one bunch are different. The actual infection rate is estimated gradually precisely by sampling inspection in each round.

Details

Kybernetes, vol. 52 no. 1
Type: Research Article
ISSN: 0368-492X

Keywords

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