International Gold Number
The International Gold Number (IGN) is a measure of the ability of a substance to protect gold from tarnishing. It is defined as the number of milligrams of the substance required to prevent the tarnishing of 100 mL of a 1% gold chloride solution for 30 minutes.
The IGN is an important parameter for assessing the effectiveness of corrosion inhibitors for gold. A high IGN indicates that the substance is effective in preventing gold from tarnishing, while a low IGN indicates that the substance is not effective.
The IGN can be determined by a variety of methods, including the ASTM D4303-14 standard test method. This method involves exposing a gold chloride solution to a test substance for a period of 30 minutes. The solution is then visually inspected for tarnishing. The IGN is the lowest concentration of the test substance that prevents tarnishing.
The IGN is a useful tool for selecting corrosion inhibitors for gold. It can be used to compare the effectiveness of different inhibitors and to determine the optimal concentration of inhibitor required to achieve the desired level of protection.
Factors Affecting the International Gold Number
The IGN is affected by a number of factors, including:
* The type of gold chloride solution used
* The concentration of the gold chloride solution
* The temperature of the solution
* The pH of the solution
* The presence of other ions in the solution
Applications of the International Gold Number
The IGN is used in a variety of applications, including:
* The selection of corrosion inhibitors for gold
* The development of new corrosion inhibitors for gold
* The evaluation of the effectiveness of corrosion inhibitors for gold
The IGN is a valuable tool for understanding the corrosion behavior of gold and for developing strategies to prevent gold from tarnishing.
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