The paper has 5 chapters: on metal in general, metal corrosion, metal protection, conclusion and literature. The first chapter covers everything in general about metal. Metal as a material for top requirements with a wide range of applications. The constant development of new species as well as the multiple possibility of processing and recyclability show that the metal is keeping pace with modernization. Favorable economic indicators and the provision of reserves of raw materials show that there is still more than enough metal on earth. In the second chapter, we will talk about the corrosion of metals, ie the deterioration and destruction of metals, which means great material damage, sometimes with catastrophic consequences. Today there are many types of corrosion and we will mention most of them here. The third chapter describes the necessary protection of metals from corrosion. First and foremost, prepare the metal substrate well to make the protection more effective. There are several types of protection and you always choose the one that is most suitable for a particular part. The fourth chapter is the conclusion, and the fifth chapter is the literature.