Kev ua theem ntawm cov pawg ncaj qha txiav txim siab kev pab cuam lub neej ntawm cov pawg hlau, xws li qhov zoo ntawm cov xaim welded xaiv, qhov zoo ntawm vuam, qhov dav ntawm vuam, thiab lwm yam. qhov zoo tshaj ntawm kev ua tom qab. Pickling yog qhov tseem ceeb Cov txheej txheem yooj yim los tiv thaiv xeb, thiab qhov zoo tshaj ntawm cov kub-dip plating, xws li lub sijhawm kub-dip, qhov zoo ntawm kev kho saum npoo, txhua yam cuam tshuam rau qhov zoo ntawm kev tiv thaiv kev kho ntawm cov pawg.
