Laboratory Test to Evaluate the Vapor- Inhibiting Ability of Volatile Corrosion Inhibitor Materials for Temporary Protection of Ferrous Metal Surfaces
|Publication Date:||29 May 2018|
This standard describes a test method for evaluating the VIA of various forms of VCI materials to reduce corrosion on the surface of ferrous metals.
The essence of this standard test method is a relatively quick, inexpensive, and basic laboratory test in a reusable sealed jar to determine the VIA of VCI materials to reduce corrosion on the surface of ferrous metals (VIA-Ferrous test). The test is labeled as quick, requiring only 24 hours. It is inexpensive compared to custom testing of parts or subassemblies in long-term controlled atmosphere chamber conditions to simulate conditions in a specific application, or field tests. An experienced laboratory should be able to achieve reasonable and reproducible results in distinguishing between VCI materials that have VIA-Ferrous properties and those that do not, including the VIA-Ferrous performance component of multimetal VCI materials.
This VIA-Ferrous test method is characterized as basic, since it is a basic qualitative test with limited differentiation among VCI materials. Finer differentiation and comparisons of relative performance among VCI materials is beyond the scope of this test method.
A numerical Graded rating system is established for describing and reporting the VIA-Ferrous functionality of the VCI sample tested. The user of this VIA-Ferrous test method may specify a pass/fail Grade, as described in Paragraph 6.6, to be used for the VIA-Ferrous test.
An optional compatibility check is described to determine whether a VCI-treated barrier material (e.g., film, paper) that is intended for temporary protection of ferrous metals causes corrosion of copper (see Section 7). The copper compatibility check is not required unless specified by the manufacturer or user of the VCItreated barrier material. Further tests related to nonferrous metals are beyond the scope of this VCI-Ferrous test standard