Safes, initially made of metal, saw industrial production begin in 1818 with the British company CHUBB. In the 1960s, electronic combination locks became widespread, and intelligent technologies such as fingerprint recognition and networked alarms were subsequently applied, forming a multi-functional product system encompassing anti-theft, fireproofing, and anti-magnetic properties.
Safe surface treatment generally refers to the application of metal electrodeposition (commonly known as electroplating), coating (spraying), chemical oxidation (coloring), or other processing methods to cover or form a protective film on the surface of parts. This film primarily serves as corrosion protection, while also enhancing aesthetics and product durability, making it a crucial factor in directly evaluating product quality. Common methods for evaluating surface treatment include: thickness measurement of the coating layer, adhesion testing, salt spray and humidity testing, and visual inspection. For coatings, methods include coating adhesion, hardness testing, humidity testing, and visual inspection.
