The methods of removing the above phenomenon can be divided into physical and chemical removal.

 

　　1,physical clearance

 

　　Remove the yellow spots with a polishing abrasive.But this method is more suitable for the flat stone material that has not been installed,for the stone material that has been installed or special-shaped stone material meaning is not big,and cost labor cost material.

 

　　2.Chemical removal

 

　　It is known that the chief component of rust is a mixture of iron hydroxide and iron hydroxide.So as long as the materials and methods are correct,chemical removal is the most convenient and economical.The traditional chemical cleaning agent mainly has two kinds,namely by the hydrochloric acid,the corrosion inhibitor,the acid fog to raise the preparation,the activator and so on preparation hydrochloric acid rust remover and oxalic acid rust remover(oxalic acid preparation of saturated solution).The advantage of these two kinds is clean fast,cost is low,but after treatment if did not flush in time with water or wash not thoroughly,often contrary to one's desire,not treated yellowing,treated place instead of"old disease relapse",serious will destroy the glossiness of stone material.