Sewage detection alarm apparatus

The invention discloses a sewage detection alarm apparatus which comprises a metal shell. The metal shell is subjected to coating treatment which includes steps: 1) sequentially adding, by weight, 1-2parts of styrene, 3.3 parts of N,N-dimethylformamide, 1.9 parts of fatty acid methyl ester and 1.2 parts of alum into 50 parts of deionized water, and well mixing; 2) sequentially adding, by weight,12.5 parts of high-carbon fatty alcohol-polyoxyethylene ether, 7.8 parts of hydroxypropyl methyl cellulose, 2.2 parts of N,N-diphosphonyl aspartic acid and 1.3 parts of phosphoric acid, and continuingstirring to achieve a well mixed state, so that coating treatment liquid is prepared; 3) impregnating the metal shell into the coating treatment liquid is prepared, taking out and drying. The sewagedetection alarm apparatus with the metal shell surface coated with a protective film is great in performance and high in surface finish quality. 本发明公开了种污水检测报警仪，其包括金属壳体，该金属壳体经过覆膜处理，所述覆膜处理包括如下步骤：1)将1～2重量份苯乙烯、3.3重量份N,N-二甲基甲酰胺、1.9重量