larry
:某品牌涂料，环氧富锌的名称就叫Barrier，而无机锌才是起电化学保护的锌粉品种。
(2013-06-02 14:46) 
There are two requirements essential for effective operation of organic zinc-rich coatings:
1. Zinc in the vehicle, in order to provide the cathodic protection required by zinc-rich coatings, must be in particle-to-particle contact or contain a conductive filler, such as iron phosphide, to make an electrically conductive path through the organic matrix. Without this particleto-particle contact, zinc in the coating essentially would be inert and surrounded by the organic vehicle,
which would not allow the zinc to go into solution and provide the cathodic protection.
2. The second important consideration in organic zinc-rich primers is that the vehicle or carrier of zinc pigment be alkali resistant. This is important since zinc, particularly under chloride environments, reacts to form a strong alkali that would adversely effect any alkali-sensitive resin or binder.The primary organic resins used to make organic zinc-rich primers are chlorinated
rubbers, phenoxy resins, or catalyzed epoxy resins. While there are a number of other
materials that can be used, these are the principal ones applied to steel structures.
从第一条可以看出，Organic zinc-rich primer 是完全可以利用到锌的阴极保护作用的。
还有一点，完整的涂层起到是barrier作用，而锌的作用是在涂层不在intact的状态，出现discontinuities的时候起作用的
