Metal Corrosion. Electroplating (Защита от металлов от коррозии. Гальванотехника)

Read the international words, guess their meanings and give the Russian equivalents.

Graphitic, concentration, factor, forms, aluminium, passive, metal, identify, perforate, metallography, proportion, magnesium, temperature, technical managers, module.

2. Read and translate the following verbs.

To categorize, to damage, to confine, to divide, to re-passivate, to protect, to oxidize, to combine, to release, to contain, to reduce, to support, to react, to encounter.

3. Match the English phrases from column A with the Russian phrases in column B.

4. Read and translate the text. Summarize it in Russian.

Corrosion can be categorized in some common types: uniform corrosion, pitting corrosion, galvanic corrosion, crevice corrosion, concentration cell corrosion, graphitic corrosion.

What is pitting corrosion? Pitting Corrosion is the localized corrosion of a metal surface confined to a point or small area that takes the form of cavities. Pitting corrosion is one of the most damaging forms of corrosion.

Pitting factor is the ratio of the depth of the deepest pit resulting from corrosion divided by the average penetration as calculated from weight loss.

Pitting corrosion is usually found on passive metals and alloys such aluminium alloys, stainless steels and stainless alloys when the ultra-thin passive film (oxide film) is chemically or mechanically damaged and does not immediately repassivate. The resulting pits can become wide and shallow or narrow and deep which can rapidly perforate the wall thickness of a metal.

The shape of pitting corrosion can only be identified through metallography. (From www.engineeringtoolbox.com).

5. Read the text again. Decide whether the following statements are true or false.

1. Corrosion can be divided into four types.

2. Pitting corrosion refers to corrosion occurring in confined spaces to which the access of the working fluid from the environment is limited.

3. Pitting corrosion is the least damaging form of corrosion.

6. Translate the following text. What is its main idea?

Crevice corrosion is an intense local attack within crevices or shielded areas on metal surfaces exposed to corrosive solutions. It is characteristically encountered with metals and alloys which rely on a surface oxide film for corrosion protection, e.g., stainless steels, titanium, aluminum, etc. The crevices can be inherent in the design of the equipment (e.g.