Within 200mm area of re-bar end surface, it should be free of rust, oil dirt, concrete slurry etc. The contaminated re-bar should be cleaned for electroslag welding.

钢筋端部200 mm范围不应有锈蚀、油污、混凝土浆等污染，受污染的钢筋应清理干净后才能进行电渣压力焊焊接。

youdao

Rust, oil stain, moisture and other impurities should be cleaned before welding.

焊前必须对焊件清除铁锈、油污、水份等杂质。

youdao

Walking to the beach, blobs of rust-colored oil glisten from the Gulf spill.

CNN: STORY HIGHLIGHTS

After dismantling its brake drums, carburetor, motor head and oil pan to sand off the rust, he gave the refurbished car to his mother in exchange for lifts on his newspaper route.

FORBES: Almost Out of the Woods

One of the Rice University scientists conducted experiments in which flakes of rust were made into nanoparticles by heating them in coconut or olive oil at 350C and could then be used in water purification.

BBC: Millions of Bangladeshis are forced to drink unsafe water