从来没这么严重过。但自从有了铝门，就出现了，看来还是和双金属有关。读这段：

A class action lawsuit filed in the United States District Court in New Jersey claims that Ford used aluminum hoods but failed to properly insulate them from "old iron-based connecting and supporting parts," despite knowing that "would give rise to galvanic coupling" and corrosion.[1]

It goes on to say that the automaker went on to conceal this inevitable problem from buyers, drastically reducing the long-term value of their vehicles.

Ford not only denies this claim, but says the suit is so lacking in merit that it should be dismissed. Last fall, Judge Kevin McNulty granted only part of Ford's request, dismissing one of three counts, allowing the case to continue.[1]

How Much Did Ford Know About the Problem?

Ford can deny concealing the problem until the cows come home, but actions speak louder than words. In 2004 the manufacturer sent dealers a technical service bulletin (TSB) about bubbling and blistering under the paint on aluminum body panels due to "iron contamination of the aluminum panel".

The TSB goes on to say that "testing has revealed that the aluminum corrosion was caused by iron particles working their way into the aluminum body part, prior to it being painted."

Hey Ford, what was that about not knowing this was an issue?

事出有因，查有没有实据，还不敢断言：）