sacrificial protection

sacrificial protection

The use of a metallic coating, such as a zinc-rich paint, to protect steel. In the presence of an electrolyte, such as salt water, a galvanic cell is set up and the metallic coating corrodes instead of the steel.
References in periodicals archive ?
The works comprise the design, supply, installation and commissioning of a new sacrificial protection system for the above pier.
Given the properties of fulvic acid, it is probable that the corrosion of chromium plating is caused by a sequence of reactions such as the following: the calcium chloride sprayed in large quantities in Russia and the fulvic acid in Russian soil give rise to an ion exchange reaction which generates hydrochloric acid and thereby reduces the pH value; fulvic acid bonds with chromium (to form a complex) giving rise to changes in chromium passivation film properties; and changes occur in the sacrificial protection effect of the plating film.
The purpose of this paper was to demonstrate the sacrificial protection (SP) technique and preventing the corrosion of dental metals.
Sacrificial protection is very simple and cost effective method to prevent the dental material from corrosion.
This can result in good sacrificial protection during earlier stages of the coating service life.
zinc dust content and morphology, can influence the sacrificial protection and, therefore, the service life duration of a zinc-rich coating.
Bierwagen's invention of magnesium-rich primers protects aluminum alloys in the same way that zinc-rich primers provide sacrificial protection for ferrous substrates.
Caddy Armour is a chrome-free, bi-metallic corrosion protection coating system that combines an inorganic basecoat for sacrificial protection with an organic topcoat for barrier protection.
The concept was considered when it was realized that a stabilized particulate Mg powder was available which allowed active metal sacrificial protection of Al and its alloys.
There is some evidence that the electrical connectivity of the Zn particles carries over from the PVC = CPVC (circa 60-70% by volume) to PVC = Volume Percolation Threshold (5) for Zn (~30% by volume for spherical particles), so some sacrificial protection occurs over this range even while the Zn is being consumed by sacrificial oxidation.
Toppings are considered to be sacrificial protection for structures and can be removed and replaced when needed typically every 15 to 40 years.
The galvanised zinc and the organic top-coat create a high performance anti-corrosion coating which provide a powerful 'sacrificial and barrier protection combination' for the steel substrate; any degradation of the tough barrier coating is countered by the sacrificial protection of the galvanised zinc base coat.