Whether nitrite is used alone or in

Whether nitrite is used alone or in conjunction with pH buffer- ing agents, relatively high concentrations are needed to estab- lish a protective film, usually on the order of 700 to 1200 mg/L to completely inhibit pitting corrosion. Once the protective film has been established, the nitrite concentration can be lowered slightly to 700 to 1000 mg/L . Some sources have stated that the required nitrite level is influenced by the amount of chloride and sulphate present in the water5, 6 because they can affect the stability of the magnetite layer. As with all anodic inhibitors, severe pitting can occur at low concentrations (

Hasil (Bahasa Indonesia) 1:

Whether nitrite is used alone or in conjunction with pH buffer- ing agents, relatively high concentrations are needed to estab- lish a protective film, usually on the order of 700 to 1200 mg/L to completely inhibit pitting corrosion. Once the protective film has been established, the nitrite concentration can be lowered slightly to 700 to 1000 mg/L . Some sources have stated that the required nitrite level is influenced by the amount of chloride and sulphate present in the water5, 6 because they can affect the stability of the magnetite layer. As with all anodic inhibitors, severe pitting can occur at low concentrations (<500 mg/L as NaNO ). In other words, too little nitrite is actually worse than none at all because low levels of nitrite will speed up the corrosion process.Loss of nitrite can occur via electrochemical and biological processes. In the former case, if corrosion continues, nitrite can be reduced at the cathode to form ammonia7 according to the equation:

Hasil (Bahasa Indonesia) 2:

Apakah nitrit digunakan sendiri atau bersama dengan pH buffer- ing agen, konsentrasi yang relatif tinggi diperlukan untuk pem- lish film pelindung, biasanya di urutan 700-1200 mg / L untuk benar-benar menghambat korosi sumuran. Setelah film pelindung telah ditetapkan, konsentrasi nitrit dapat diturunkan sedikit untuk 700-1000 mg / L. Beberapa sumber menyatakan bahwa tingkat nitrit yang diperlukan dipengaruhi oleh jumlah klorida dan sulfat hadir di water5, 6 karena mereka dapat mempengaruhi stabilitas lapisan magnetit. Seperti dengan semua inhibitor anodik, pitting parah dapat terjadi pada konsentrasi rendah (<500 mg / L sebagai NaNO). Dengan kata lain, terlalu sedikit nitrit sebenarnya lebih buruk daripada tidak ada sama sekali karena rendahnya tingkat nitrit akan mempercepat proses korosi.
Kehilangan nitrit dapat terjadi melalui proses elektrokimia dan biologi. Dalam kasus yang pertama, jika korosi terus, nitrit dapat dikurangi pada katoda untuk membentuk ammonia7 menurut persamaan: