... in the acid (hydrochloric acid or sulfuric acid) of a certain ingredient, exposing a clean metal surface, and then immersed in the ... towers, light poles, microwave towers, shipbuilding, iron pieces, a variety of profiles, seamless pipe, highway guardrail, traffic signs iron pieces, ... zinc iron matrix is destructive erosion, zinc slag will be a sharp increase, the plating can not be . The plating ...