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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion and Fatigue Behavior of High-Strength Steel Treated with a Zn-Alloy Thermo-diffusion Coating
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Corrosion and Fatigue Behavior of High-Strength Steel Treated with a Zn-Alloy Thermo-diffusion Coating

机译：用锌合金热扩散涂层处理高强度钢的腐蚀和疲劳性能

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High and low cycle fatigue tests were conducted on high-strength steel using four-point bending. The materials tested were ASTM A723 steel in the as-machined condition, grit-blasted condition, MIL-DTL-16232 heavy manganese phosphate-coated condition, and ASTM A1059 Zn-alloy thermo-diffusion coated (Zn-TDC). The ASTM A723 steel base material exhibits a yield strength of similar to 1000 MPa. The effects of the surface treatments versus uncoated steel were examined. The fatigue life of the Zn-TDC specimens was generally reduced on ascoated specimens versus uncoated or phosphate-coated specimens. Several mechanisms are examined including the role of compressive residual stress relief with the Zn-TDC process as well as fatigue crack initiation from the hardened Zn-Fe alloy surface layer produced in the gas-metal reaction. Additionally, the effects of corrosion pitting on the fatigue life of coated specimens are explored as the Zn-TDC specimens exhibit significantly improved corrosion resistance over phosphate-coated and oiled specimens.
机译：使用四点弯曲对高强度钢进行高和低循环疲劳试验。测试的材料是ASTM A723钢，砂砂条件，静电条件，MIL-DTL-16232重锰涂覆条件，ASTM A1059 Zn合金热扩散涂层（Zn-TDC）。 ASTM A723钢基材表现出类似于1000MPa的屈服强度。检查了表面处理与未涂覆钢的影响。 Zn-TDC标本的疲劳寿命通常在涂层标本与未涂覆或磷酸涂覆的标本上减少。检查了几种机制，包括对Zn-TDC工艺的压缩残余应力消除的作用以及来自在气金属反应中产生的硬化Zn-Fe合金表面层的疲劳裂纹引发。另外，探讨Zn-TDC样本在磷酸盐涂覆和上油标本上显着提高耐腐蚀性，探讨了腐蚀点对涂层样本疲劳寿命的影响。

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