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The purpose of this study is to develop laboratory techniques to evaluate the inhibition efficiency of salt neutralizer (SN) solutions in the corrosion protection of metal alloys associated with winter maintenance equipment.

The corrosion resistance of alloys A36, B36 and B152 treated with SNs was evaluated by accelerated corrosion testing (ASTM B117) and electrochemical polarization curves. Characterization of inhibition solutions was performed by contact angle measurements, scanning electron microscopy, ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy.

Salt neutralizer systems act as mixed inhibitors in acidic media by changing the corrosion resistance ability of metal alloys because of the adsorption of surfactant molecules through their hydrophilic heads. The correlation of the corrosion rate of metal alloys and the inhibitor efficiency showed the influence of the SN type, its concentration, its effective adsorption constant and its contact angle on the alloy surface. Salt neutralizers with higher manufacturer’s recommended wash concentrations (MRWC) to critical wash concentration ratio, lower contact angle on the alloy surface and higher K_eff were more successful at preventing corrosion on the alloys tested.

The results of this work provide, for the first time, both quantitative and qualitative information of the properties of washing techniques in the use of effective cleaning strategies for protecting winter maintenance equipment from corrosion. Other state departments of transportation facing similar weather conditions will be benefited by identifying measures and techniques to increase the corrosion resistance of their equipment assets.

Many environmental influences tend to reduce the life of the refinery distillation crude units.

The adhesion between electroless copper and a substrate is one of the most important factors in the reliability of thermoplastic printed circuit boards. The purpose of this paper is to investigate the effects of mechanical grinding and acid etching of thermoplastic substrate materials on the adhesion of copper deposited by an electroless copper plating process. The base material of the test substrates was a new high temperature thermoplastic polyphenylene oxide (PPO) compound.

The effects of pre‐treatment on plastic surfaces are analyzed by the following methods: Fourier transform infrared (FTIR), SEM, the Dyne surface energy test and the surface roughness test. The adhesion between electroless copper and thermoplastic substrate is measured with a peel strength test.

The results showed that mechanical grinding of the substrates significantly increased adhesion but the highest adhesion is gained by using an acid etch treatment before electroless plating. These results indicated that adhesion between copper and the substrates was not directly proportional to the roughness and surface energy values.

The conventional sweller/desmear treatment used in a printed circuit board factory for pre‐treating epoxy based laminates prior to electroless plating is not suitable for these PPO compound boards. The copper adhesion is adequate when the substrates are etched with sulphuric acid/chromate solution. In that case the bonding between the metal layer and the plastic surface is stronger than the bondings between the polymer chains of the thermoplastic material. The adhesion mechanism of electroless copper in these mechanically abraded samples is mechanical interlocking of metal particles.

This paper aims to report the best practices of deicer corrosion control adopted by the Washington State Department of Transportation (WSDOT) to preserve the performance, reliability and value of its highway maintenance equipment assets.

To enable quantitative analyses, data were collected from a site visit to WSDOT, as well as from a survey of maintenance practitioners from various transportation agencies. The direct costs related to equipment corrosion aggravated by the exposure to roadway deicers were analyzed, along with the direct benefits of mitigating such corrosion, using WSDOT as a case study. In addition, the same preliminary cost benefit analysis was conducted for an “average” Department of Transportation in a northern climate.

Both cases show a highly favorable benefit-to-cost ratio for enhanced investment in controlling the risk of deicer corrosion.

It has not yet been possible to confirm this compelling argument because the analysis is partly based on assumptions instead of fully based on actual data.

This work highlights the need to collect the relevant data such that future analysis and sensitivity analysis can be substantiated with actual data on costs and benefits. It concludes with a few suggestions for implementation.

Many components in highway maintenance equipment fleet are at the risk of metallic corrosion, which is exacerbated in service environments where roadway deicers have been applied. This work lays the foundation for future research into this important issue.

The study reported in this paper aims to synthesize some new curcumin containing sulphadiazine and sulphathiazole dyestuffs and study their application in dyeing silk fabrics rendering the dyed fabric antibacterial.

Simultaneous dyeing and antibacterial finishing for silk fabric using a new antibacterial acid dye having a modified chemical structure to curcumin were conducted. This modification of curcumin dye was carried out by introducing sulphonamide containing heterocyclic rings sulphadiazine and sulfathiazole through coupling with curcumin. All newly synthesized dyes were characterized by elemental analyses and spectral data (IR, 1H-NMR and MS). The dyeing characteristics of these dyestuffs were evaluated at optimum conditions. Antibacterial activities of the dyed samples at different concentrations of both dyes were studied against gram-positive (Staphylococcus aureus) and gram-negative (Salmonella typhimurium) bacteria.

The synthesized curcumin-containing sulphonamide dyes were applied on silk fabrics. The modified dyes exhibited good fastness properties compared to curcumin dye at optimum conditions. It was found that synthesized dyes exhibit good fastness and antibacterial properties efficient against gram-positive and gram-negative bacteria. The dyed silk fabrics showed higher antibacterial efficacy after many times of washing.

Curcumin, a common natural dye used for fabric and food colouration, was used as an antimicrobial finish due to its bactericidal properties on dyed textiles. A common dyeing process could provide textiles with colour as well as antimicrobial properties. Novel antibacterial dyestuff containing curcumin moieties with sulphonamide coupler components were shown to be an interesting natural colorant for silk with high antimicrobial ability of the dyed silk fabrics. This work has afforded a new acid dye that can be used in medical textile.

Corrosion in atmospheric distillation is caused by hydrochloric acid produced by the hydrolysis of water soluble magnesium and calcium chlorides found in the crude oil. Corrosion of copper metal during distillation of Geisum crude oil (vapour phase ) at 100, 150, 200, 250, and 300°C in absence and presence of 5 per cent H₂O was studied. The corrosion of copper metal in the vapour phase is higher than in the liquid phase. Hydrogen sulphide is not the only corrodant present; hydrogen chloride and volatile acids are other important corrodants. The effect of adding different inhibitors with various concentrations on the corrosion of copper metal was also studied. The rate of inhibition increases with addition of chlorinated hexadecylamine as compared with that obtained by addition of ammonia alone. The inhibitive efficiency of copper increased rapidly as the copper benzotriazole film grows rapidly.

The purpose of this research is to prepare a dispersion resin with good dispersity and a colour paste with good stability. At present, the colour paste is being prepared using the pigment dispersion resin which has the group quaternary ammonium. The dispersion resin prepared has good dispersity of pigment and extender. However, the stability of storage and construction of the colour paste is relatively poor, which has a negative influence on the application of cathodic electrodeposited (CED) coatings. However, the detailed investigation on the dispersion resin and the stable colour paste has not been reported.

Three steps are adopted to prepare the dispersion resin, that is blocking toluene diisocyanate (TDI), quaternary ammoniation of blocked TDI and ring opening of epoxy resin. The resultant dispersion is used to prepare the colour paste. The factors, which have an influence on the dispersity of the dispersion resin and stability of the colour paste, are optimised.

The typical recipes of preparing the dispersion resin and the resultant colour paste are obtained. The dispersity of the dispersion resin and stability of the colour paste are good based on the typical recipe. In addition, the film of the CED coating is smooth, dense and hard when the colour paste is used in the CED coating.

The dispersion resin can be used to prepare a colour paste, which can be used in the CED coatings. In addition, it also can be applied as a binder of coatings and adhesions.

The factors, which have an influence on the dispersity of the dispersion resin and stability of the colour paste, are studied in detail. The typical recipes of preparing the dispersion resin and the resultant colour paste are obtained. Based on the typical recipe, the dispersity of the dispersion resin and stability of the colour paste are good.

Reducing Level of Alcohol in Inks ‐ A medium‐sized US ink manufacturer recently needed to reduce the level of alcohol in its bases for water‐based inks. Ciba Geigy Pigments Division's Inks Technical Centre developed an improved formulation, containing half the alcohol of the previous one and 40 per cent more pigment to allow the ink producer to meet VOC limits and increase production efficiency, at no additional cost.

In this study, the conditions of obtaining neutral calcium sulfonate which is added to engine oils as a detergent‐dispersant was studied. For this purpose, post‐dodecyl benzene sulfonic acid, obtained from post‐dodecyl benzene which remains as the bottom product during the production of dodecyl benzene sulfonate was used as the initial substance. Additionally, the reactor to be used in the production of neutral calcium sulfonate was designed and the amounts of spindle‐oil, toluene, raw sulfonic acid solution and Ca(OH)₂ used during neutralization were determined.

1. Analyze the factors influencing the creation of a social enterprise, while appreciating the theoretical perspectives on social entrepreneurship and social innovations. 2. Analyze the impact of social enterprises on sustainable development. 3. Recognize the need for different types of strategies in the varied situation. 4. Analyze the business model.

Shashi Kumar, the CEO of Akshayakalpa Farms & Foods Pvt Ltd (Akshayakalpa), is determined to take the business to the next growth level. He has integrated technology to measure and monitor the quality of milk and to reach out to tech-savvy customers. Owing to the preservative-free and short life of milk, he believes that redesigning the marketing and distribution strategies is the only way to ensure the massive expansion and growth that will enable Akshayakalpa to reach out to customers directly and quickly. Another issue he was facing was a lag in receivables. Their receivables from vendors were delayed and held up because of issues related to product spoilage and returns. This has posed a liquidity challenge to Akshayakalpa. Amidst all these challenges, he wants to develop the best strategy to take the business forward to the next level.

This case can be used in undergraduate or postgraduate courses in Management, Social Entrepreneurship and Business Sustainability with special relevance to social enterprise creation, enterprise growth strategies, sustainable development, sustainable business models, etc.

Teaching notes are available for educators only.

CSS 3: Entrepreneurship.