If it's to be painted on zincification or steeling or other metal surfaces, it's better to paint a film of EMME P401 water rust prevention metal primer before apply EMME E442.

如在镀锌铁或其它金属表面使用，最好是先涂一道EMME P 401的水性防锈金属底漆，再涂刷emme E442效果会更佳。

youdao

Iron reacts with water and air to produce rust.

铁和水及空气发生反应产生铁锈。

《牛津词典》

The pipes were beginning to rust, discolouring the water.

管子开始生锈，水都变颜色了。

《牛津词典》

They waddle down to the water to wash off the rust-colored guano that stains their pelts and produces a pungent odor that within days becomes expected with each landing.

FORBES: Go with the Floe

In the ancient oceans, green rust's ability to pull nickel out of the water would have been critical for some life forms, since nickel is an important nutrient for microbes that produce methane.

MSN: What green rust did long ago to the big blue ocean

Since NASA's Curiosity rover made its way to Mars, it's been sending back a wealth of data from our rust-colored planetary neighbor: landscape photos, radiation readings and even evidence of liquid water.

ENGADGET: NASA Curiosity rover digs Mars, finds sulfur, chlorine and organic traces of unknown origin