ʻO ka ʻili o ka pā kila kila, ka plasticity kiʻekiʻe, ka paʻakikī a me ka ikaika mechanical, acid, alkaline gas, solution and other media corrosion.He kila kila ia e kū'ē i ka'ōpala, akā,ʻaʻole kū pono i ka'ōpala.ʻO ka pā kila kila i ka lewa, ka mahu a me ka wai a me nā mea ʻino ʻē aʻe nāwaliwali o ka pā kila, a ʻo ka pā kila kūpaʻa ʻakika e pili ana i ka waikawa, ka alkali, ka paʻakai a me nā mea ʻino ʻē aʻe o ke kino corrosion medium corrosion o ka pā kila.