Dezincification: appears in the higher zinc α-brass, especially the α + β-brass. The potential of the zinc electrode is far less than the copper, a low electrode potential of zinc is first dissolved in an aqueous solution of neutral salt, copper residue in a porous film on the surface, and the brass composition and under the surface of the micro-battery, the brass becomes the anode being accelerate corrosion. Plus 0.02 ~ 0.06% As prevent dezincification. Stress corrosion: a quarter crack "or" self-crack "refers to the brass products stored during generates automatic rupture phenomenon. This phenomenon is the residual stress corrosion medium ammonia product generated by the combined effects of SO2 and moist air. Brass Zn-containing higher the amount, the more easily since the crack. To avoid brass from cracking, all the brass cold working products or semifinished products, the need to carry out a low temperature (260 to 300 ° C), annealing to eliminate the residual internal stress generated by the products during cold working. In addition, brass added 0.02 ~ 0.06% As, or 1.0 to 1.5% of Si can be significantly reduced cracking tendency of its own. http://tjdsgg.cn