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一、前言 随着内燃机技术的不断发展。对镀铬环的产量和质量提出了更高的要求。国外主要活塞环厂家镀铬环的配套率超过50％,许多机型实现了全环组镀铬,国内这方面差距甚大。因此,提高镀铬环的产量和质量是当务之急。 镀层与基体结合力是镀后质量关键,当前国内多数为酸碱处理,阳极刻蚀处理等旧工艺,国外先进工业国家镀铬环镀前采用液体喷砂处理,废除酸碱处理及阳极刻蚀处理。经液体喷砂后可直接冲击、电镀。工艺设备简单,质量有保证,且避免因刻蚀带来镀铬杂质的增加,从而净化了镀液。 镀后液体喷砂处理,表面生成均勾密布的小凹坑,起着储油及初期磨合作用,能去除轻微的铬瘤毛刺,经液体喷砂后的铬层硬度明显提高,并提高了疲劳强度及抗变形能力。所以,镀前镀后都必须大力推广液体喷砂。
First, the foreword With the continuous development of internal combustion engine technology. The chrome ring production and quality put forward higher requirements. Foreign main piston ring manufacturers chrome ring supporting rate of more than 50%, many models of the whole ring chrome plating, the domestic gap in this area is very large. Therefore, to improve the production and quality of chrome ring is a top priority. Coating and substrate adhesion is the key to quality after plating. At present, most of the domestic old processes such as acid-base treatment and anodic etching are advanced. Liquid blasting is applied before plating in advanced industrialized countries, abolishing acid-base treatment and anodic etching . After the liquid blasting can be a direct impact, electroplating. Process equipment is simple, quality assurance, and to avoid corrosion caused by the increase of chromium impurities, thus purifying the bath. Plated liquid sandblasting, the surface of the small hooks are well-distributed, plays the role of oil storage and initial wear and tear, can remove a slight chromium tumor burr, the liquid sandblasting chromium layer hardness increased significantly, and increased fatigue Strength and resistance to deformation. Therefore, before plating must be vigorously promote liquid sandblasting.