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Determination of Melting Point of New Pyridinium Salts as Corrosion Inhibitors by Open Capillary Method (CAT#: STEM-PPA-0109-YJL)

Introduction

Corrosion inhibitors are commonly used to prevent metal dissolution, particularly in aqueous solutions. Hydrochloric and sulfuric acids are widely used in the metallurgical industry in a variety of techniques such as pickling metals to extract scale, deactivation of gear in atomic power plants, chemical or electrochemical methods in oil refineries, and rocket fuel influences. Factors in rocket science, etc. In general, corrosion inhibitors are applied in a limited amount to corrosive media with the aim of slowing the rate of corrosion by adsorption. Organic compounds with heteroatoms, such as sulfur, nitrogen, oxygen, and a couple of bonds, use an adsorption mechanism to effectively prevent corrosion even at low concentrations.

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Principle Applications Procedure Materials

Principle

Melting point is a characteristic property of solid crystalline substance. It is the temperature at which the solid phase changes to the liquid phase. This phenomenon occurs when the substance is heated.
In all major pharmacopoeias the open capillary method is described to determine the melting point (slip point) for fats, fatty acids, paraffin, and waxes. In a glass capillary tube open at both ends (1), 10 mm of sample is introduced (2), chilled to a given temperature and immersed into a water bath (3/4). The melting point with open capillary, also known as slip point or slip melting point, is the temperature at which the substance begins to rise in the capillary due to the effect of the increasing temperature and buoyancy.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Prepare the substance.
2. Affix one of the capillaries to a thermometer.
3. Place the thermometer with an affixed capillary into a glass.
4. Increase the temperature.

Materials

• Sample Type: crystalline compounds

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