The sacrificial metal
corrodes instead of the protected metal of the pipeline.
It may be decided to use a relatively thin sacrificial metal
, like zinc nickel or zinc alloy plating, containing heat cured coating or even apply a thermally sprayed aluminium coating.
One group had Zn metal soldered to the Cu wire as a sacrificial metal (Figure 4(b)).
One group of this second set of samples used Al as a sacrificial metal (Figure 5(b)), while the other was left as-constructed.
The metal oxide is zinc oxide; the covering layer is a sacrificial metal
; and the thicknesses (eAg1, eAg2, eAg3) of the silver layers (Ag1, Ag2, Ag3) vary in a ratio of between 0.8 and 1.2 and are such that eAg1 [less than or equal to] eAg3 [less than or equal to] eAg2 and eAg1 corresponds to the thickness of the silver layer closest to the substrate and eAg3 corresponds to the thickness of the silver layer furthest from the substrate.
Zinc coatings are used to provide a sacrificial metal
that prevents corrosion, thus protecting the base metal.
* Steel is sometimes covered with the sacrificial metal. Galvanized steel, for example, is steel covered with zinc.
Here, zinc and magnesium serve as sacrificial metals that not only protect the area of immediate contact, but also protect beyond the metal in each direction.
The settling of aggregates of the dispersed phase, or precipitates of the dissolved species, caused by flowing a suspension or emulsion between two sacrificial metal
electrodes excited by an AC current is termed electro-coagulation.
Formulators use three basic strategies to provide corrosion protection: barrier technology to prevent oxygen and water from getting to the surface; passivation of the metal surface using corrosion inhibiting additives; and galvanic protection using a sacrificial metal
Traditional coatings rely on sacrificial metals
such as zincs and chromates for corrosion protection.
Because the scientists could control how much of these sacrificial metals
were inserted, the process yielded gold wires with precisely determined gaps.