铝用缓蚀剂

Materials protection Pub Date : 1966-07-01 DOI:10.3323/JCORR1954.15.11_495

A. Roebuck, T. R. Pritchett

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引用次数: 1

摘要

提供阴极保护、阳极保护或总体总保护的抑制剂，可通过评估其由动电位测量得出的电流-电位关系来选择。抑制剂必须仔细选择，以适应特定的应用要求。含有镁作为主要合金元素的5000系列合金在盐水介质中具有比1100或高纯度合金更强的耐腐蚀性。凝胶型抑制剂，如琼脂，阻断阴极反应，引起明显的阴极极化。胺类抑制剂也会影响阴极特性。它们在抑制铝在酸性介质中的腐蚀方面是有用的。铬酸盐是有效的阳极抑制剂。铬酸镍的有效性高于铬酸钾，这表明铬酸盐的有效性并不完全是由于它们的氧化能力。/作者/

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CORROSION INHIBITORS FOR ALUMINUM

INHIBITORS PROVIDING CATHODIC PROTECTION, ANODIC PROTECTION OF OVERALL GROSS PROTECTION MAY BE CHOSEN BY AN EVALUATION OF THEIR CURRENT-POTENTIAL RELATIONSHIPS AS DERIVED BY POTENTIODYNAMIC MEASUREMENTS. INHIBITORS MUST BE CAREFULLY CHOSEN TO FIT THE PARTICULAR APPLICATION REQUIRED. THE 5000 SERIES ALLOYS, CONTAINING MAGNESIUM AS THE MAJOR ALLOYING ELEMENT, ARE SHOWN TO HAVE GREATER CORROSION RESISTANCE IN SALINE MEDIA THAN DO THE 1100 OR HIGH-PURITY ALLOYS. JEL-TYPE INHIBITORS SUCH AS AGAR-AGAR, BLOCK THE CATHODIC REACTIONS, CAUSING MARKED CATHODIC POLARIZATION. AMINE INHIBITORS ALSO AFFECT THE CATHODIC CHARACTERISTICS. THEY SHOULD PROVE USEFUL IN INHIBITING ALUMINUM CORROSION IN ACID MEDIA. CHROMATES ARE EFFECTIVE ANODIC INHIBITORS. THE INCREASED EFFECTIVENESS OF NICKEL CHROMATE OVER POTASSIUM CHROMATE INDICATED THAT THE EFFECTIVENESS OF CHROMATES WAS NOT ENTIRELY DUE TO THEIR OXIDIZING ABILITY. /AUTHOR/

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Materials protection

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