Standards Development

Scope

This document specifies a test method for evaluating the vapor inhibiting ability of volatile corrosion inhibitor materials to ferrous metals.

This document is especially suitable for evaluating the vapor inhibiting ability of laminate, powder and liquid volatile corrosion inhibitor materials. This test method may be referenced for evaluating other forms of volatile corrosion inhibitor materials.

Purpose

Industrial development cannot be separated from metal materials, but metal materials, especially steel materials, tend to be corroded in natural environment or under certain working conditions. In order to effectively prevent or slow down the corrosion of metal materials, many methods have been used to protect metal, among which adding volatile corrosion inhibitor to the carrier material is an effective method. Volatile corrosion inhibitor materials are mainly used for temporary protection of metals and their products. Volatile corrosion inhibitor, also known as VCI, is the corrosion inhibitor that can reach the metal surface in the form of vapour. Volatile corrosion inhibitors generally have small molecular weight and can automatically volatilize particles with corrosion inhibition effect at normal temperature.

As long as its vapour can reach the metal surface, the metal can be protected. Because of the high degree of freedom of volatile corrosion inhibitor particles, the surface of metal products, as well as the inner cavity, groove and even gap parts can be protected. At the same time, it can keep the original mechanical properties of metal materials unchanged, and the surface of the protected metal usually does not need to be treated before use. Volatile corrosion inhibitor material consists of volatile corrosion inhibitor and carrier material, such as making volatile corrosion inhibitor into VCI paper, VCI film, VCI oil, VCI liquid and other products. Volatile corrosion inhibitor can also be used separately, such as making it into powder, tablet and pill for direct application. VCI materials are widely used in metallurgy, automobile and parts, equipment manufacturing, power and electronics and other fields, with different application requirements and methods. Under certain circumstances, it may also need to be used together with other materials, and the reasonable design and accurate evaluation of its corrosion inhibition performance are very important.

The technical performance evaluation of VCI materials mainly includes vapor inhibiting ability, vapor inhibiting ability after exposure, contact corrosivity, compatibility, etc. Countries around the world take the standards of their own countries or associations (groups) as the guiding documents, and there is no uniform performance evaluation method in the world, which may lead to differences in performance evaluation and increase additional costs and disputes. With the increasing integration of the world economy, VCI materials produced in different regions may be used in various regions of the world. Vapor inhibiting ability is one of the most important performance indicators of VCI materials. In combination with the application of existing evaluation methods, this project plans to develop a unified evaluation test method to achieve the purpose of evaluating the consistency of vapour inhibiting ability.(Please use this field or attach an annex)