熱鍍(du)鋅(xin)(xin)(xin)層構(gou)成(cheng)(cheng)(cheng)進程(cheng)是(shi)鐵(tie)(tie)(tie)(tie)基體(ti)(ti)與(yu)(yu)外面(mian)的(de)(de)純(chun)(chun)鋅(xin)(xin)(xin)層之(zhi)間構(gou)成(cheng)(cheng)(cheng)鐵(tie)(tie)(tie)(tie)-鋅(xin)(xin)(xin)合(he)(he)金(jin)(jin)(jin)(jin)的(de)(de)進程(cheng),工件外表在(zai)熱浸鍍(du)時構(gou)成(cheng)(cheng)(cheng)鐵(tie)(tie)(tie)(tie)-鋅(xin)(xin)(xin)合(he)(he)金(jin)(jin)(jin)(jin)層,才使得鐵(tie)(tie)(tie)(tie)與(yu)(yu)純(chun)(chun)鋅(xin)(xin)(xin)層之(zhi)間很好結合(he)(he),其進程(cheng)可簡單地敘說(shuo)為(wei):當(dang)(dang)鐵(tie)(tie)(tie)(tie)工件浸入(ru)熔(rong)(rong)融(rong)(rong)的(de)(de)鋅(xin)(xin)(xin)液時,首先(xian)在(zai)界(jie)面(mian)上構(gou)成(cheng)(cheng)(cheng)鋅(xin)(xin)(xin)與(yu)(yu)α鐵(tie)(tie)(tie)(tie)(體(ti)(ti)心(xin))固熔(rong)(rong)體(ti)(ti)。這(zhe)是(shi)基體(ti)(ti)金(jin)(jin)(jin)(jin)屬鐵(tie)(tie)(tie)(tie)在(zai)固體(ti)(ti)狀態下(xia)溶有鋅(xin)(xin)(xin)原(yuan)子(zi)所構(gou)成(cheng)(cheng)(cheng)一種(zhong)晶(jing)體(ti)(ti),兩種(zhong)金(jin)(jin)(jin)(jin)屬原(yuan)子(zi)之(zhi)間是(shi)交融(rong)(rong),原(yuan)子(zi)之(zhi)間引力比(bi)較小。因(yin)而,當(dang)(dang)鋅(xin)(xin)(xin)在(zai)固熔(rong)(rong)體(ti)(ti)中達到(dao)飽和后,鋅(xin)(xin)(xin)鐵(tie)(tie)(tie)(tie)兩種(zhong)元素原(yuan)子(zi)彼此分(fen)(fen)散(san),分(fen)(fen)散(san)到(dao)(或叫滲入(ru))鐵(tie)(tie)(tie)(tie)基體(ti)(ti)中的(de)(de)鋅(xin)(xin)(xin)原(yuan)子(zi)在(zai)基體(ti)(ti)晶(jing)格中搬遷,逐漸(jian)與(yu)(yu)鐵(tie)(tie)(tie)(tie)構(gou)成(cheng)(cheng)(cheng)合(he)(he)金(jin)(jin)(jin)(jin),而分(fen)(fen)散(san)到(dao)熔(rong)(rong)融(rong)(rong)的(de)(de)鋅(xin)(xin)(xin)液中的(de)(de)鐵(tie)(tie)(tie)(tie)就(jiu)與(yu)(yu)鋅(xin)(xin)(xin)構(gou)成(cheng)(cheng)(cheng)金(jin)(jin)(jin)(jin)屬間化合(he)(he)物FeZn13,沉入(ru)熱鍍(du)鋅(xin)(xin)(xin)鍋底,即為(wei)鋅(xin)(xin)(xin)渣。當(dang)(dang)工件從浸鋅(xin)(xin)(xin)液中移出時外表構(gou)成(cheng)(cheng)(cheng)純(chun)(chun)鋅(xin)(xin)(xin)層,為(wei)六方晶(jing)體(ti)(ti)。其含鐵(tie)(tie)(tie)(tie)量不大(da)于(yu)0.003%。