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中文摘要：
分析测试H13钢表面镀铬层的表面形貌与结构、粗糙度、显微硬度、厚度、电化学阻抗及极化曲线,研究了H13钢基体表面粗糙度R_a对其表面镀铬层结构与性能的影响。结果表明：电镀时间小于30min时,随着R_a的增加,镀铬层晶粒尺寸减小,堆积趋于稀疏;电镀30 min后,不同R_a的镀铬层晶粒尺寸及分布基本相同;电镀60 min后,随着R_a的增加,镀铬层晶粒的尺寸明显增大;当R_a值小于0.504μm时,（200）面为铬晶粒的优势生长面,当R_a值为0.504μm时,（211）面为铬晶粒的优势生长面;随电镀时间的增加,镀铬层的厚度和显微硬度逐渐增大;当电镀时间相同时,随着R_a的减少,镀铬层的厚度减少,显微硬度增加,镀铬层的耐蚀性逐渐提高。
英文摘要：
The effect of surface roughness of H13 steel on chromium coatings＇ structure and properties was investigated by surface morphology and structure analysis,electrochemical impedance and polarization curve testing.The results show that when the electrodepositing time is less than 30 min, with the increase of the surface roughness of steel matrix,the grain size of chromium coatings decreases, and the grain accumulation becomes sparse;when the electrodepositing time is 30 min,the grain size and distribution of chromium coatings obtained under different surface roughness are same;when the time is more than 30 min,with the increase of the surface roughness,the grain size of chromium coatings increases obviously.When the surface roughness value R_a is less than 0.504μm,the advantage growth surface of chromium grain is（200）,and when R_a was 0.504μm,the advantage growth surface of chromium grain changes to（211）;the thickness and the microhardness of chromium coatings increase with the increase of electrodepositing time;with the reduce of surface roughness at a same electrodepositing time,the thickness of chromium coatings decrease,the microhardness increases,and the corrosion resistance of chromium coatings gradually increases.
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