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首页> 外文会议>World foundry congress on fonderie sans frontieres casting without borders giessen ohne grenzen >AMELIORATION DE LA RESISTANCE A LA CORROSION DES LAITONS ET DES CUPRO-ALUMINIUMS MOULES PAR TRAITEMENT THERMIQUE
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AMELIORATION DE LA RESISTANCE A LA CORROSION DES LAITONS ET DES CUPRO-ALUMINIUMS MOULES PAR TRAITEMENT THERMIQUE

机译：通过热处理改善黄铜和Cupro-铝模具的耐腐蚀性

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Good use is made of the excellent performance of copper alloys in many corrosive environments. They are subject, however, to a special form of deterioration ― selective corrosion. This process may take the form of a slow generalized attack of the surface or of pitting, sometimes dangerous. Suitable heat treatments, deduced from the equilibrium diagrams, yield substantial improvement. In the case of aluminium bronzes, generalized corrosion can be avoided by observing the simple rule relating admissible aluminium content to nickel content. We show that the tendency to pitting as evaluated by a particular potentio-kinetic test is sensitive both to chemical composition and to the differences in structure observed between the as-cast and more or less deeply annealed structures. A customer may be led to state more precise composition limits for aluminium and nickel within the existing standards and to require corrosion-proofing annealing. Brasses are used primarily in water that is fresh but may be more or less aggressive depending on the country or area. Two-phase foundry alloys may in this case be corroded by dezincifi-cation. An annealing treatment may be devised that isolates the beta prime phase in the middle of the alpha phase, the proportion of which is increased. This change of structure retards the kinetics of corrosion. Longer lives can be attained by using brasses having a lower equivalence factor and thus greater mechanical strength.
机译：良好的用途是在许多腐蚀性环境中铜合金的优异性能。然而，它们是一种特殊形式的恶化 - 选择性腐蚀。该过程可以采用慢的地表或点蚀的慢一般攻击形式，有时是危险的。合适的热处理，从平衡图中推断，产生显着的改善。在铝镀金的情况下，通过观察允许铝含量与镍含量相关的简单规则，可以避免广义腐蚀。我们表明，通过特定的电容性 - 动力学测试评估的点倾向，既敏感到化学成分，也敏感到铸造等或多或少深失的结构之间观察到的结构的差异。客户可以导致铝和镍在现有标准中的更精确的成分限制，并且需要耐腐蚀退火。黄铜主要用于新鲜的水，但根据国家或地区，可能更加或多或​​少。在这种情况下，两相铸造合金可以通过脱锌纤维腐蚀。可以设计退火处理，使得在α相的中间分离β蛋白酶，其比例增加。这种结构的变化延迟了腐蚀的动力学。通过使用具有较低等效系数的黄铜可以获得更长的寿命，从而实现更大的机械强度。

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