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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Resistances of Steel Pipe Coated with Two Types of Enamel by Two Coating Processes
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Corrosion Resistances of Steel Pipe Coated with Two Types of Enamel by Two Coating Processes

机译：两种涂布工艺用两种搪瓷涂覆钢管的耐腐蚀性

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The corrosion behaviors of uncoated, enamel-coated, and epoxy-coated steel samples were evaluated in 3.5?wt.% NaCl solution with open-circuit potential, electrochemical impedance spectroscopy and potentiodynamic polarization tests. Two types of enamel (powder and slurry) were coated on steel samples in electrostatic and wet spraying processes, respectively. Twelve 25?mm?×?25?mm steel samples were cut from an API 5L X65 pipe of 323.850?mm in outer diameter and 9.525?mm in wall thickness. They were divided into four groups of three identical samples. Each group represents one of the four conditions: uncoated, powder enamel-coated, slurry enamel-coated and epoxy-coated. Scanning electron microscopy images revealed that the powder and slurry enamel coatings were approximately 180 and 235?μm thick, respectively. The powder enamel coating has fewer but larger isolated pores than the slurry enamel coating. Electrochemical tests consistently indicated that the powder and slurry enamel coatings provided slightly better and worse corrosion protection to the coated steel samples, respectively, than the epoxy coating. The charge transfer resistances of all the coated samples are approximately 10_(8)times larger than that of the uncoated samples. All the coated samples were unlikely corroded within 2?h of immersion.
机译：在3.5·wt.％NaCl溶液中评价了未涂覆，搪瓷涂覆和环氧涂覆钢样品的腐蚀行为，具有开口电路电位，电化学阻抗光谱和电位辐射极化测试。在静电和湿喷涂过程中涂覆两种类型的牙釉质（粉末和浆料）。 12个25？mm？×25？mm钢样品从外径323.850Ωmm的API 5L X65管中切割，壁厚9.525Ωmm。它们分为四组三个相同的样本。每组代表四种条件中的一种：未涂覆的，粉末涂层，浆料搪瓷涂覆和环氧涂层。扫描电子显微镜图像显示粉末和浆料搪瓷涂层分别为约180和235Ω·μm厚。粉末搪瓷涂层具有比浆料搪瓷涂层更少但较大的隔离孔隙。电化学试验始终表明，粉末和浆料搪瓷涂层分别为涂层钢样品的腐蚀保护略好，腐蚀保护，而不是环氧涂层。所有涂覆样品的电荷传递电阻大约比未涂覆样品的10〜（8）倍。所有涂覆的样品在浸泡的2℃内不太可能腐蚀。

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