C15220 tooj liab ntawv

Copper cov khoom ua rau nws haum rau qee yam khoom siv tshawb fawb thiab cov cuab yeej kuaj.

Thaum siv cov ntawv tooj liab, nws yog ib qho tseem ceeb uas yuav tsum xav txog yam xws li thickness, qhov loj, thiab tiav, vim tias cov no tuaj yeem cuam tshuam rau lawv cov kev ua tau zoo hauv ntau daim ntawv thov. Tsis tas li ntawd, kev ua haujlwm nrog tooj liab yuav tsum muaj qee yam kev paub txog nws cov khoom, xws li nws nyiam oxidize thiab txhim kho patina thaum lub sijhawm.

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