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首页> 美国卫生研究院文献>Materials >The Effect of Vanadate Phosphate Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions
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The Effect of Vanadate Phosphate Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions

机译：钒酸盐磷酸盐氟化合物对AZ31镁合金在稀氯化物溶液中水腐蚀的影响

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The anodic polarization response of magnesium alloy AZ31 was first characterized during exposure to aerated 0.1 M NaCl solutions with millimolar additions of NaVO , Na PO , Na HPO , NaF and various pairings to assess their ability to inhibit corrosion kinetics and retard localized corrosion. Each of the candidate inhibitors reduced the corrosion rate of the alloy to some degree. A Na PO –NaVO pair produced a good inhibiting effect decreasing the corrosion rate to about 10 A/cm , which was two orders of magnitude lower than the uninhibited control case. A Bliss Independence assessment indicated that this inhibitor pair acted synergistically. A Na HPO –NaVO pair reduced the corrosion rate to 10 A/cm but was not assessed to be acting synergistically. The NaVO –NaF pair did not reduce the corrosion rate significantly compared to the control case and was an antagonistic pairing. SEM imaging showed film formation due to exposure, which appears to be the origin of the observed inhibition. The resistance to localized corrosion was assessed as the difference in the breakdown potential and the corrosion potential, with larger values indicating a lower probability of localized corrosion during free corrosion exposures. The effects of the inhibitors on this characteristic were mixed, but each of the inhibitor pairs yielded potential differences in excess of 100 mV. A conceptual conversion coating process based on a mixture of vanadate and phosphate compounds were demonstrated. A fluoride-bearing formulation produced coatings whose total impedance was increased by a factor of two compared to an uncoated control. A fluoride-free formulation produced coatings whose corrosion resistance was increased by more than a factor of three.
机译：镁合金AZ31的阳极极化响应首先在暴露于充气的0.1 M NaCl溶液中并加入毫摩尔的NaVO，Na PO，Na HPO，NaF和各种配对来表征，以评估其抑制腐蚀动力学和延迟局部腐蚀的能力。每种候选抑制剂都会在一定程度上降低合金的腐蚀速率。 Na PO -NaVO对产生良好的抑制作用，将腐蚀速率降低至约10 A / cm，这比未抑制的对照情况低两个数量级。极乐独立评估表明，该抑制剂对具有协同作用。 Na HPO – NaVO对可将腐蚀速率降低至10 A / cm，但未评估其协同作用。与对照组相比，NaVO-NaF对没有显着降低腐蚀速率，并且是拮抗对。 SEM成像显示由于曝光而形成的膜，这似乎是观察到的抑制作用的起源。评估局部腐蚀的抵抗力是击穿电位和腐蚀电位之差，值越大表明在自由腐蚀暴露期间发生局部腐蚀的可能性越低。抑制剂对这种特性的影响是混合的，但是每种抑制剂对产生的电位差都超过100 mV。演示了基于钒酸盐和磷酸盐化合物的混合物的概念性转化涂层工艺。含氟制剂生产的涂料与未涂覆的对照组相比，其总阻抗增加了两倍。无氟配方生产的涂层的耐腐蚀性提高了三倍以上。

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