水喉漏水


條水喉漏水,如果換不銹鋼牙曲,D牙啱唔啱?係唔係用水喉膠布就ok?
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要換喉!
換返同sz銅喉啦

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原本果款,用左幾多年呀?
我諗正常貨品,可以用十幾二十年

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條喉用左十幾年,係唔明點解個曲位漏水

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個曲位係鉛水喉件用左十幾年生鏽漏水唔出奇.

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銹蝕在外面又一小撻,似有咸水長期滴在曲喉上侵蝕

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如個位係比洗衣機(非飲食用水類)用,去五金舖買個四分鐵喉曲(即鉛水喉曲)換番上去都可以幾長命。要換銅喉既話最好就全部換,唔好銅駁鐵,如換上銅喉曲,因有galvanic corrosion效應,會令鐵喉氧化更快蝕至滲漏
https://en.wikipedia.org/wiki/Galvanic_corrosion

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用鋼塑土修補!

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搵左好多間都冇鉛水喉曲,用住銅先。
師兄講話用銅會令鐵加快銹蝕,我都同意。但其實個水龍頭都係用銅造,只係電導層鉻上去,咁樣其實係唔係都會加快銹蝕?

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本帖最後由 diputs 於 2016-9-20 00:38 編輯

回覆 9# 大喱仔
上面條link個wikipedia都有提及兩種金屬的anodic index相差愈少愈好(相對侵蝕速度較慢)
Quoted: [For normal environments, such as storage in warehouses or non-temperature and humidity controlled environments, there should not be more than 0.25 V difference in the anodic index. For controlled environments, in which temperature and humidity are controlled, 0.50 V can be tolerated. For harsh environments, such as outdoors, high humidity, and salt environments, there should be not more than 0.15 V difference in the anodic index.]

黃銅的anodic index是-0.4~-0.45V,鐵是-0.85V,而電鉻約-0.6V,係電鉻面接觸鐵喉時侵蝕速度相對會慢d,但鉛水喉或鉛水喉配件有喉牙部份通常d電鍍層會極薄甚至冇電鍍,而黃銅龍頭的螺牙及內框(電鍍時電場分佈關系)某些位置(如牙底)電鍍層都會極薄,在那些位置只能看作是基本材料的接觸(沒有電鍍層的幫助),所以鉛水喉牙接龍頭位處都係較快被侵蝕生鏽,時日長左都好大機會係相關位置滲漏。
不過有好多強國生產龍頭係用鋁合金壓注再電銅電鉻,唔係用黃銅做基材,鋁合金的anodic index是-0.9~-0.95V與鐵的很接近,有侵蝕會先侵蝕鋁合金唔係鐵喉。

如你唔換條入牆鐵喉,個黃銅曲最好作暫時用(遲d換番鉛水喉曲),因長時日後,接觸黃銅內牙既鐵喉牙會被侵蝕,到時你想唔換都唔得。

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