鋅鋼護欄怎么選
市場上的鋅鋼護欄產(chǎn)品種類較多,顏色多樣,各種的風(fēng)格的鋅鋼護欄都有,復(fù)古、歐式、古典的風(fēng)格等。鋅鋼護欄的商鋪琳瑯滿目,讓人們在挑選過程中眼光繚亂,不知道怎么去挑選,更加不知道去怎么辨別鋅鋼護欄的質(zhì)量的好壞。那么怎么去辨別鋅鋼護欄質(zhì)量的好壞呢?
1、首先是外觀質(zhì)量
鍍鋅構(gòu)件表面具有均勻完整的鍍層,顏色一致,表面具有實用性光滑,不允許有流掛、滴瘤或多余結(jié)塊。鍍件表面應(yīng)無漏鍍、露鐵等缺陷。
2、鋅層均勻性
檢查鍍鋅層均勻、無漏鍍或鍍后損傷。一般用規(guī)定濃度的硫酸銅溶液浸漬規(guī)定的時間、次數(shù),要求其表面無金屬銅的紅色沉積物。

3、鍍鋅層重量
由于鍍鋅工藝的原因,鋼護欄表面的鋅層不可能完全均勻,一般標準用兩個指標衡量鍍鋅量:平均鋅附著量M、最低鋅附著量Mmin。實際控制鋼護欄表面的鍍鋅量時,測若干點的鍍鋅量,要求這些點的鍍鋅量的平均值不低于M,同時每一點的鍍鋅量必須大于Mmin。
4、鋅層附著性
鍍鋅層與基底金屬結(jié)合牢固。鋼護欄熱浸鍍鋅時,不僅僅是鋅液敷在鋼護欄表面。鋼材浸在一定溫度的鋅浴中一定時間后,鋼材表面還與鋅液發(fā)生反應(yīng)形成了鋅鐵合金層。鍍鋅工藝掌握的好,不僅可以達到一定的鍍鋅量,還能夠形成一定厚度的鋅鐵合金層。鍍鋅層的附著性一般用錘擊法進行檢測。錘擊法中不僅規(guī)定了錘擊的高度、錘擊落點的間距,還規(guī)定了錘頭的材質(zhì)(硬度)、錘頭尖角的角度。這些規(guī)定使錘擊試驗的結(jié)果具有可評價性。不合標準的榔頭、不合標準的敲擊方法作出的結(jié)果是不可信、不能起評價作用的。
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