Why is the surface not smooth after the metal spring is plated?

Today, I took back 200 million chrome-plated springs from the electroplating factory. I planned to pack and ship the products after inspection. As a result, I saw how the spring surface is so many spots! Hand touch and tie it! What to do, the problem came out, first find the reason from yourself, take the rough embryo that was not sent to the plating before, check it out, see that there is a lot of slag stuck on the rough embryo, and the hand is the machine is cutting the spring. When the slag sticks to the rough embryo, and we do not clean the rough embryo, it is directly used for electroplating. When plating, the slag is directly covered in the spring. After the spring is plated, the surface is not smooth.
'Why is the surface of the hardware spring not smooth after plating?

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