Corrosionist  The Website of Corrosion and Corrosion Control
You are here >>> Home - - Corrosion Rust FAQ - Vapor-phase corrosion inhibitors  
                                           

VAPOR-PHASE INHIBITORS
 
 
  
                                                VAPOR-PHASE INHIBITORS

Vapor-phase corrosion inhibitors (also referred to as volatile corrosion inhibitors (VCIS)) deposit from a vapor phase on the metal surface to be protected.

Therefore, Vapor-phase corrosion inhibitors are protective as long as there is suffcient inhibitor in the vapor phase surrounding the metal to maintain a o condensed phase on the surface. The vapor phase acts only as a transport medium from a sourw to the corrosion site.

The vapor-phase corrosion inhibitor should be volatile enough so that all surfaces to be protected are readily reached but not so volatile that it is rapidly depleted through leaks in the containment vessel in which it is used.

Formulations have been developed that protect ferrous and nonferrous metals.

Vapor-phase inhibitors for ferrous metals are volatile arnines, such as the nitrite, carbonate, and benzoate salts of dkyclohexylamine, cyclohexykunine, and hexamethyleneimine and other polar substances. It appears that the organic portion of the molecules only provides volatility.

Inhibitors for nonferrous metals with vapor space enclosures provide some protection, but they are not as effective as inhibitors used with ferrous metals.

Vapor-phase corrosion inhibitors are used to impregnate wrapping paper or are placed loosely inside a closed container. They are widely used for corrosion protection within packaging.
                                                  

reference: MATERIAL DETERIORATION PREVENTION AND CONTROL GUIDE OF ARMY MATERIAL, PARTONE, METALS (MlL HDBK-73S (MR))

see also:

corrosion protection methods

corrosion types

cathodic protection

                                                   
 
 
  Corrosion Control | Corrosion Prevention | Corrosion Inhibitor | Metal Corrosion |Copper Pipe Corrosion | Why does copper turn Green | What is Corrosion | Basic Welding - Introduction to Welding |  Define Oxidation | Chemical Properties of Copper | Printable detailed periodic Table of Elements | Who invented Copper | Current Daily Scrap Metal Prices | Printable detailed periodic table of elements | Who discovered Venus | Who discovered the orion's belt | Who discovered Silver | Who discovered Stem Cells | Who discovered Saturn |