化學蝕刻只能以零件原有表面狀態為基準，累進進行切削。因此經過化學蝕刻(ke)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)后的(de)(de)(de)(de)零(ling)件形(xing)狀(zhuang)(zhuang)(zhuang)及表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)狀(zhuang)(zhuang)(zhuang)態(tai)(tai)，與(yu)零(ling)件原(yuan)始的(de)(de)(de)(de)形(xing)狀(zhuang)(zhuang)(zhuang)與(yu)表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)狀(zhuang)(zhuang)(zhuang)態(tai)(tai)有直接關(guan)系，更多的(de)(de)(de)(de)情況是經(jing)化(hua)(hua)學(xue)蝕刻(ke)(ke)后的(de)(de)(de)(de)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)完全與(yu)原(yuan)來(lai)的(de)(de)(de)(de)初始基準表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)狀(zhuang)(zhuang)(zhuang)態(tai)(tai)保持平行。而成形(xing)蝕刻(ke)(ke)邊(bian)緣(yuan)的(de)(de)(de)(de)幾(ji)何(he)形(xing)狀(zhuang)(zhuang)(zhuang)，又主要與(yu)材料厚(hou)度(du)(du)有關(guan)。從這(zhe)些(xie)限制(zhi)可以(yi)看出，化(hua)(hua)學(xue)蝕刻(ke)(ke)不(bu)能(neng)用于表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)粗糙的(de)(de)(de)(de)板(ban)材、棒材等來(lai)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)形(xing)狀(zhuang)(zhuang)(zhuang)復(fu)雜的(de)(de)(de)(de)零(ling)件，如需要在復(fu)雜零(ling)件上(shang)的(de)(de)(de)(de)某些(xie)部位加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)出很薄(bo)的(de)(de)(de)(de)旗板(ban)，或些(xie)淺的(de)(de)(de)(de)凸緣(yuan)時，就必(bi)須先用機械的(de)(de)(de)(de)方(fang)式(shi)將全部幾(ji)何(he)外形(xing)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)到一(yi)定程度(du)(du)，而接下(xia)來(lai)的(de)(de)(de)(de)化(hua)(hua)學(xue)蝕刻(ke)(ke)只是平行于已加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)好的(de)(de)(de)(de)表(biao)(biao)(biao)(biao)面(mian)(mian)(mian)，把金屬均(jun)勻地(di)蝕刻(ke)(ke)去掉一(yi)層，以(yi)達到所要求的(de)(de)(de)(de)厚(hou)度(du)(du)和(he)形(xing)狀(zhuang)(zhuang)(zhuang)。同(tong)時化(hua)(hua)學(xue)蝕刻(ke)(ke)無法在所加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)的(de)(de)(de)(de)邊(bian)緣(yuan)進(jin)行垂直側面(mian)(mian)(mian)的(de)(de)(de)(de)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)，只能(neng)加(jia)(jia)(jia)工(gong)(gong)(gong)(gong)出一(yi)個半徑(jing) 近似于腐(fu)蝕深度(du)(du)的(de)(de)(de)(de)圓弧(hu)形(xing)狀(zhuang)(zhuang)(zhuang)。

  圖(tu)形(xing)(xing)防(fang)蝕(shi)(shi)層的粘附力(li)和在加工過程中腐蝕(shi)(shi)劑成分(fen)的變化(hua)，會(hui)引(yin)起的腐蝕(shi)(shi)系數(shu)的改變，化(hua)學(xue)蝕(shi)(shi)刻邊緣的兒何形(xing)(xing)狀也(ye)會(hui)有一定的偏差，有時這(zhe)個(ge)偏蓋還會(hui)比較大(da)。所以(yi)(yi)化(hua)學(xue)蝕(shi)(shi)刻 不可以(yi)(yi)用于加工公差要求很嚴的結構零(ling)件。

  另(ling)一(yi)個必須注意(yi)的(de)(de)問題，就是化學蝕(shi)(shi)(shi)(shi)刻不(bu)(bu)4用(yong)(yong)于(yu)(yu)(yu)(yu)加(jia)(jia)X窄而(er)深(shen)(shen)(shen)的(de)(de)凹槽，這是因為在化學蝕(shi)(shi)(shi)(shi)刻反應(ying)所(suo)產生(sheng)的(de)(de)氣(qi)(qi)(qi)泡，會(hui)集聚在防蝕(shi)(shi)(shi)(shi)層(ceng)邊(bian)(bian)(bian)緣(yuan)的(de)(de)下面(mian)，而(er)這些被堵在防蝕(shi)(shi)(shi)(shi)層(ceng)下面(mian)的(de)(de)氣(qi)(qi)(qi)泡，事(shi)實上(shang)起了(le)把金屬表(biao)(biao)面(mian)與(yu)腐蝕(shi)(shi)(shi)(shi)劑隔開的(de)(de)作(zuo)用(yong)(yong)。以(yi)致造(zao)成一(yi)種(zhong)(zhong)非常不(bu)(bu)規則的(de)(de)腐蝕(shi)(shi)(shi)(shi)，形成很(hen)不(bu)(bu)整齊的(de)(de)邊(bian)(bian)(bian)緣(yuan)，這對(dui)(dui)于(yu)(yu)(yu)(yu)深(shen)(shen)(shen)度大(da)的(de)(de)加(jia)(jia)工(gong)(gong)是一(yi)件很(hen)麻煩(fan)的(de)(de)事(shi)，雖然(ran)一(yi)些性能不(bu)(bu)錯的(de)(de)防蝕(shi)(shi)(shi)(shi)材料較軟(ruan)，易于(yu)(yu)(yu)(yu)使氣(qi)(qi)(qi)泡排出(chu)，何當加(jia)(jia)工(gong)(gong)到一(yi)定深(shen)(shen)(shen)度后，即使采用(yong)(yong)機械攪拌的(de)(de)方(fang)法(fa)也不(bu)(bu)足以(yi)使防蝕(shi)(shi)(shi)(shi)層(ceng)邊(bian)(bian)(bian)緣(yuan)的(de)(de)氣(qi)(qi)(qi)泡完全排出(chu)，對(dui)(dui)于(yu)(yu)(yu)(yu)這種(zhong)(zhong)加(jia)(jia)工(gong)(gong)有效(xiao)的(de)(de)方(fang)法(fa)就是釆用(yong)(yong)比較費(fei)時的(de)(de)手工(gong)(gong)方(fang)法(fa)，杷閣形邊(bian)(bian)(bian)緣(yuan)的(de)(de)防蝕(shi)(shi)(shi)(shi)層(ceng)修(xiu)平。另(ling)一(yi)種(zhong)(zhong)可能的(de)(de)原因就是腐蝕(shi)(shi)(shi)(shi)液表(biao)(biao)面(mian)張力(li)的(de)(de)作(zuo)用(yong)(yong)，這種(zhong)(zhong)情況同(tong)樣(yang)也會(hui)在窄或小(xiao)半徑(jing)表(biao)(biao)面(mian)造(zao)成腐蝕(shi)(shi)(shi)(shi)不(bu)(bu)能迸行的(de)(de)情況。對(dui)(dui)于(yu)(yu)(yu)(yu)深(shen)(shen)(shen)度較大(da)的(de)(de)凹槽加(jia)(jia)工(gong)(gong)要求(qiu)寬度不(bu)(bu)低于(yu)(yu)(yu)(yu)4mm。對(dui)(dui)于(yu)(yu)(yu)(yu)深(shen)(shen)(shen)度不(bu)(bu)大(da)的(de)(de)凹槽或圓孔要求(qiu)寬度或半徑(jing)不(bu)(bu)小(xiao)于(yu)(yu)(yu)(yu)深(shen)(shen)(shen)度的(de)(de)5倍。

  化(hua)(hua)學蝕(shi)(shi)刻(ke)(ke)加(jia)工(gong)的(de)>』個(ge)(ge)限制(zhi)楚用丁化(hua)(hua)學腐(fu)蝕(shi)(shi)方(fang)(fang)法(fa)鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)的(de)加(jia)工(gong),化(hua)(hua)學蝕(shi)(shi)刻(ke)(ke)鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)和機械(xie)方(fang)(fang)法(fa)及電解方(fang)(fang)法(fa)鈷孔(kong)(kong)(kong)(kong)都不(bu)相同，它(ta)不(bu)能(neng)(neng)(neng)加(jia)T出后兩者(zhe)所能(neng)(neng)(neng)加(jia)工(gong)出來的(de)孔(kong)(kong)(kong)(kong)形。電解鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)由于(yu)不(bu)是(shi)用腐(fu)蝕(shi)(shi)劑，它(ta)是(shi)通過一個(ge)(ge)相當于(yu)鉆(zhan)(zhan)(zhan)頭的(de)直(zhi)管供應電解液來鉆(zhan)(zhan)(zhan)穿(chuan)非常硬的(de)材料，選擇合(he)適(shi)的(de)工(gong)藝方(fang)(fang)法(fa)可(ke)以鉆(zhan)(zhan)(zhan)出孔(kong)(kong)(kong)(kong)壁平直(zhi)的(de)孔(kong)(kong)(kong)(kong)來。而化(hua)(hua)學蝕(shi)(shi)刻(ke)(ke)鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)只(zhi)能(neng)(neng)(neng)鉆(zhan)(zhan)(zhan)出不(bu)規則的(de)錐形孔(kong)(kong)(kong)(kong)。對于(yu)深度化(hua)(hua)學蝕(shi)(shi)刻(ke)(ke)鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)由于(yu)蝕(shi)(shi)刻(ke)(ke)時間長(chang)，而使(shi)公差增(zeng)大(da)，所以化(hua)(hua)學鉆(zhan)(zhan)(zhan)孔(kong)(kong)(kong)(kong)除特殊(shu)情況(kuang)外(wai)很(hen)少(shao)采(cai)用。