... restricted yield strength tubing 限定屈服强度油管 retarded acid 钝化酸 retrievable inner barrel 可回收的内筒 ...
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ASTM标准a 380(1996)将这些酸归为清洁用酸而不是钝化用酸。
The ASTM Standard a 380 (1996) refers to these acids as cleaning acids, not passivating acids.
磷酸是一种弱氧化酸，有时也用于特定的钝化操作中；但，没有任何正式的文件说明磷酸可作为钝化用酸。
Phosphoric acid is a weak oxidizing acid sometimes specified in passivation procedures; however, there is no formal documentation referencing the use of phosphoric acid as a passivating acid.
化学作用4：可进行无机酸清洁和钝化以去除或钝化氧化铁。
Chemistry 4 Mineral acid cleaning and passivation can be performed for iron oxide removal or passivation.
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