Method for treating and phosphatizing metal board without using acid

A method for treating and phosphatizing a metal board without using acid, comprising:

• performing a degreasing step, wherein a degreasing agent is provided to remove grease and dirt from a surface of the metal board;
• performing a blast-peening step by blasting and peening polygon blast-peening granules on the surface of the metal board through centrifugal impellers to remove an oxidized layer;
• performing a washing step to wash the surface of the metal board, so as to remove powders generated from the blast-peening step;
• performing a phosphatizing step to form a phosphate coating on the surface of the metal board, so as to provide protection;
• performing another washing step to wash off remaining phosphatizing agents from the metal board;
• performing a rustproofing step to apply a rustproofing agent on the metal board;
• performing a drying step to dry the metal board;
• and
• performing a surface real-time observation step, wherein a detector is used to detect a status of removing the oxidized layer from the surface of the metal board in real-time, and wherein, when detecting that the powder generated from removing the oxidized layer has a characteristic in the air that undergoes a change, the blast-peening step is stopped.