Metal Corrosion. Electroplating (Защита от металлов от коррозии. Гальванотехника) - страница 14

14. Give the definitions of the words and word combinations.

1. Microbe is …

2. Sludge is …

3. Microbial flora is…

4. Velocity is …

5. Synergetics is …

15. Give the example(s) of the microbial corrosion.

16. Answer the following questions using texts from Unit 3.

1. What does microbial corrosion mean?

2. What types of microbiological corrosion do you know?

3. What are the predominant types of bacteria associated with microbial corrosion?

4. Describe anaerobic corrosion.

17. Summarize the general ideas developed in all the texts of the Unit 3.

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

Temperature, atmospheric, industry, salt, characterize, system, chloride, aggressive, factor, material, sulphide, synergistic, parameter, conventional, function, manner, transferable.

2. Read and translate the following verbs.

To classify, to attack, to expose, to increase, to promote, to contain, to contribute, to influence, to suffer, to comprise, to lead to, to correlate, to restrict, to find, to transfer, to know.

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.

Atmospheric corrosion accounts for more failures on both a tonnage basis and cost basis than any other type of environmental corrosion. Tremendous amounts of steel in automobiles, bridges ad buildings are exposed to the atmosphere and attacked by oxygen and water. The corrosion severity is increased when salt, sulfur compounds and other atmospheric contaminants are present. Atmospheric environments can be classified as: industrial, marine, rural, indoor.

Industrial environments contain sulfur compounds, nitrogen compounds, and other acidic agents that can promote the corrosion of metals. In addition, industrial environments contain a heavier loading of airborne particles, which also contribute to corrosion. Marine environments are characterized by the presence of chloride, an ion that is particularly detrimental to the corrosion behavior of many metals systems. Rural environments are the least corrosive of the atmospheric environments, being characterized by lower levels of acidic compounds and other aggressive species.

The principal factors influencing atmospheric corrosion for a given metal are moisture, temperature and the presence of contaminants in the environment.