求翻译：当氯离子进入混凝土中并到达钢筋表面，并吸附于局部钝化膜处时，可使该处PH值迅速降低，当PH值降低到4以下时钝化膜就会被完全破坏是什么意思？

When the chloride ions into the concrete and reach the steel surface, and adsorbed on the local passivation film at allows ph value there to quickly lower the passive film will be completely destroyed when the ph value is reduced to 4

When chlorine ion into a concrete and steel surfaces, and the adsorption on the local passivated film, to make the value PH PH decrease rapidly when the value is reduced to 4 passivation film is completely destroyed

When the chloride ion enters in the concrete and arrives the steel bar surface, when and adsorbs in the partial deactivated membrane place this place, may cause the PH value to reduce rapidly, when the PH value reduces to 4 below deactivates the membrane to be able to destroy completely

When the surface of chloride ions into concrete and reaches the bar and when adsorbed on the local film can rapidly reduce the PH value, when the PH value is reduced to below 4 passive film will be completely destroyed

正在翻译，请等待...