In the latter function, they work at the same time as anti-corrosive agents, as their hydrophobic nature means that water cannot reach the metal surface.
ɪnðə lˈæɾɚ fˈʌŋkʃən, ðeɪ wˈɜːk æt ðə sˈeɪm tˈaɪm æz ˈæntaɪkɚɹˈoʊsɪv ˈeɪdʒənts, æz ðɛɹ hˌaɪdɹəfˈoʊbɪk nˈeɪtʃɚ mˈiːnz ðæt wˈɔːɾɚ kænˈɑːt ɹˈiːtʃ ðə mˈɛɾəl sˈɜːfɪs.