Q & A about Hard Chrome Plating
Q1・What are the sizes of plating tanks for hard chrome plating?
Q2・What is the thickness for hard chrome plating?
Q3・What are the possible materials that can be processed with hard chrome plating?
Q4・What are the parts for hard chrome plating?
Q5・What is hard chrome plating overhaul?
Q6・What is the hardness standard required for hard chrome plating?
Q7・What shapes can be produced with hard chrome plating?
Q8・What is the thickness measurement for hard chrome plating?
Q9・What is surface roughness in hard chrome plating?
Q10・Do you handle hard chrome plate peeling?
Q11・How do you handle removal of hydrogen embrittlement in hard chrome plating?
A.1
The hard chrome plating tank has two tanks; one, with measurements of 2m W x 4m L x 3m depth; and, the other one, 1m W x 2m L x 1.5m depth.
A.2
We process hard chrome plating, as instructed in the drawing plans, to meet quality standards. The hard chrome plating thickness is calculated by the difference of the thickness before and after plating.
A.3
The materials we have processed for hard chrome plating are S45C・SS・SNCM・SKS・SUS・SCM・FCD.
We accept inquiries regarding other materials.
A.4
We can produce hard chrome plating by parts. We wrap masking tape around the parts that are not to be plated to avoid electroplating.
A.5
For the process of overhauling cylinder rods, we repair by using the methods of grinding, honing processing, hard chrome plating, and others, based on the damage condition.
A.6
The hardness of hard chrome plating meets the standards of Vickers hardness over 750 as regulated for industry chrome plating by JIS H 8615. The recent result of our company's hardness quality test was SCM440 = 1004-1086 and S45C = 1049-1052.
A.7
The shapes that can be produced with hard chrome plating are round parts and angular parts. For each shape, we can produce hard chrome plating for the entire part, external parts, or internal parts, depending on the customer's requests. We can also produce hard chrome plating for complicated shapes, such as uneven metal molds by preparing electrode devices.
A.8
The thickness measurement of hard chrome plating is calculated by using a micrometer or a cylinder gauge for round parts, and is measured before and after plating. In the case that we are not able to measure with the above method, we calculate the thickness of hard chrome plating by using a magnetic force system test method.
A.9
For drawing plans that indicate roughness on the surface for hard chrome plating, we conduct a mixed method of grinding and buffing before and after plating to meet quality standards. Currently, we produce piston rods with a surface roughness of 0.8S.
A.10
We conduct the peeling process for hard chrome plating. After the peeling process, we perform plating again.
A.11
For instructions regarding the removal of hydrogen embrittlement after plating hard chrome, we conduct a baking method, as referred by "JIS H 8615 attachment 4."
