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class="p14-infocontent-1-tit"> 鐵元素——影響鋁型材外觀質(zhì)量的罪魁禍?zhǔn)?</h1> <div id="tbdnnhnqf6" class="p14-infocontent-1-sour"> <span> 作者： </span> <span> 編輯： </span> <span> 來(lái)源： </span> <span> 發(fā)布日期： 2017.11.06 </span> </div> <div id="tbdnnhnqf6" class="p14-infocontent-1-text"> <div id="tbdnnhnqf6" class="p14-infocontent-1-text-t1"> 信息摘要： </div> <div id="tbdnnhnqf6" class="p14-infocontent-1-text-t2">去過(guò)鋁材市場(chǎng)的人應(yīng)該知道有一些鋁型材價(jià)格便宜，表面比一般的鋁型材顏色暗。這樣的鋁型材大多不合格，合金成分超差。而鋁型材表面發(fā)黑的罪魁禍?zhǔn)资氰F…</div> <div id="tbdnnhnqf6" class="clear"> </div> </div> <div id="tbdnnhnqf6" class="p14-infocontent-1-desc endit-content"><p align="center" class="MsoNormal" style="text-align:left;"> 去過(guò)鋁材市場(chǎng)的人應(yīng)該知道有一些鋁型材價(jià)格便宜，表面比一般的鋁型材顏色暗。這樣的鋁型材大多不合格，合金成分超差。而<a class="attach inline_attach" href="http://m.draorgasmos.com/product/gongyelvxingcai.html" target="_blank">鋁型材</a>表面發(fā)黑的罪魁禍?zhǔn)资氰F元素，并且它不止影響到型材的表面質(zhì)量，更影響到了鋁型材的機(jī)械性能。 </p> <p class="MsoNormal"> 1<span>、</span>鐵元素對(duì)鋁型材表面的影響 </p> <p class="MsoNormal"> <span></span><span> 在戶外和潮濕環(huán)境中，金屬材料等極易腐蝕。因此，對(duì)化學(xué)性質(zhì)較為活潑的鋁材的耐腐蝕性能要求較高。</span> <br> <span>　　純鋁以及鋁合金在空氣中很容易氧化，生成致密堅(jiān)實(shí)的氧化膜，具有很好的自我保護(hù)作用，而且，當(dāng)氧化膜被破壞的時(shí)候，還可以與氧氣反應(yīng)，重新生成氧化膜，具有很好的</span>“<span>自愈</span><span>”</span><span>功能。但是，鐵元素對(duì)鋁合金的這種</span><span>“</span><span>自愈</span><span>”</span><span>功能卻有著嚴(yán)重的影響。隨著鐵含量的增加，鋁合金的腐蝕程度依然是呈現(xiàn)劇烈的增長(zhǎng)勢(shì)頭。實(shí)驗(yàn)可知，鐵含量近乎</span><span>0</span><span>的時(shí)候，年腐蝕深度最??；鐵含量增加到</span><span>0.1%</span><span>，年腐蝕深度增加到</span><span>2</span><span>倍；鐵含量增加到</span><span>0.3%</span><span>，年腐蝕深度增加到</span><span>4</span><span>倍；鐵含量增加到</span><span>0.4%</span><span>，年腐蝕深度增加到近乎</span><span>6</span><span>倍；這是因?yàn)殇X與鐵的電勢(shì)差高達(dá)</span><span>1.2V</span><span>，鐵元素以</span><span>A1FeSi</span><span>、</span><span>FeA13</span><span>等化合物存在，散布在</span><span>鋁型材表面</span><span>，先產(chǎn)生點(diǎn)腐蝕，然后逐步沿著晶線方向發(fā)展，由點(diǎn)腐蝕發(fā)展成剝層腐蝕，</span><span>極大的</span><span>消弱了鋁合金的耐腐蝕能力。</span> </p> <p class="MsoNormal"> <span>2、鐵元素對(duì)鋁型材機(jī)械性能的影響</span> </p> <p class="MsoNormal"> Fe<span>原子在鋁合金中可以形成各種形狀的鐵相，其中以片狀鐵相最易形成、最為常見(jiàn)，該鐵相的很大負(fù)作用是可以造成鋁合金基體的斷裂，降低鋁合金的機(jī)械性能。不同的鐵元素含量對(duì)鋁合金主要機(jī)械性能影響情況見(jiàn)</span><span>下</span><span>表</span> </p> <div id="tbdnnhnqf6" class="tableScrolling" style="margin:0px;padding:0px;display:block;overflow-x:auto;text-align:center;"> <table border="1" style="text-align:center;"> <tbody> <tr> <td> <p style="text-align:center;"> <span>Fe<span style="font-family:宋體;">含量（</span><span style="font-family:Arial;">%</span><span style="font-family:宋體;">）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>腐蝕相對(duì)損失率（<span style="font-family:Arial;">%</span><span style="font-family:宋體;">）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>鐵相形態(tài)</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>耐腐蝕性拉伸強(qiáng)度（<span style="font-family:Arial;">MPa</span><span style="font-family:宋體;">）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>延伸率（<span style="font-family:Arial;">%</span><span style="font-family:宋體;">）</span></span><span></span> </p> </td> </tr> <tr> <td> <p style="text-align:center;"> <span>0.3<span style="font-family:宋體;">～</span><span style="font-family:Arial;">0.35</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>8</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>粗大針片狀<span style="font-family:Arial;">β</span><span style="font-family:宋體;">相</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>106<span style="font-family:宋體;">（弱）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>0.9</span><span></span> </p> </td> </tr> <tr> <td> <p style="text-align:center;"> <span>0.25</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>6</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>細(xì)小片狀</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>158<span style="font-family:宋體;">（中）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>1.1</span><span></span> </p> </td> </tr> <tr> <td> <p style="text-align:center;"> <span>0.2</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>3</span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>漢字狀<span style="font-family:Arial;"> α</span><span style="font-family:宋體;">相</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>174<span style="font-family:宋體;">（強(qiáng)）</span></span><span></span> </p> </td> <td> <p style="text-align:center;"> <span>1.6</span><span></span> </p> </td> </tr> </tbody> </table> </div> <p> 由此表可見(jiàn)，鐵含量微弱的變動(dòng)就會(huì)對(duì)鋁型材機(jī)械性能造成非常大的影響。可見(jiàn)廠家在選購(gòu)鋁型材時(shí)一定要選擇正規(guī)廠家，經(jīng)過(guò)嚴(yán)格檢驗(yàn)的產(chǎn)品。不能貪圖便宜而給企業(yè)造成不可估量的損失。 </p> <p class="MsoNormal" style="text-indent:21.0000pt;"> 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