sheet
The Spanish word 'chapa' refers to a 'sheet' in English. This could be referred to a sheet of material such as metal, wood, or plastic, or to a flat, thin piece or surface of something. The Spanish word 'chapa' can also be used colloquially to mean 'badge' or 'nameplate'. While it's mainly used in the context of flat materials, it can also refer to a layer or coating of a specific substance.
The door's plate is broken.
In this sentence, 'chapa' is used to mean a plate, specifically referring to a door's plate which can be a type of decoration, identifier or protector on the door that is damaged.
The car's body needs a coat of paint.
In this context, 'chapa' is referring to the body of the car. The body of the car is in need of a new paint job, demonstrated by the use of 'necesita una capa de pintura'.
She wears a badge with her name on the uniform.
In this example, 'chapa' is translated as badge, referring to an identification item that the person is wearing on her uniform bearing her name.