Metal Corrosion. Electroplating (Защита от металлов от коррозии. Гальванотехника) - страница 5
6. Защита от коррозии является одной из важнейших проблем, имеющей большое значение для народного хозяйства.
7. Основной ущерб от коррозии металла связан не только с потерей больших количеств металла, но и с порчей или выходом из строя самих металлических конструкций.
8. Вследствие коррозии металлы теряют необходимую прочность, пластичность, герметичность, тепло- и электропроводность и другие необходимые качества.
9. Коррозии подвергаются не только металлы, но и любые материалы, например бетон, пластмасса, резина или керамика.
13. Translate the following word combinations.
Разрушение металлов – electrical current – термодинамическая неустойчивость – conductivity – коррозийная среда – rust – электрохимическая коррозия – gradual destruction – руда – mechanical damage – ионное состояние – condenser tubes – металлическая конструкция.
14. Give the definitions of the words and word combinations.
1. Resistance is…
2. Ductility is…
3. Hermiticity is …
4. Heat-conducting is …
5. Electroconductivity is …
15. Give the example(s) of the chemical interaction.
16. Answer the following questions using texts from Unit 1.
1. What does corrosion mean?
2. What are the consequences of corrosion?
3. What types of corrosion do you know?
4. What conditions does rusting occur in?
17. Summarize the general ideas developed in all the texts of the Unit 1.
Unit 2
TYPES OF CORROSION
1. 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.