Steel square weld nut with black oxide.

Description

Surface blackening principle:

In order to improve the anti rust ability of steel parts, the surface of steel parts is oxidized into smooth ferric oxide with strong oxidant. The ferric oxide oxidized at low temperature (about 130 ℃) is dark black.

The surface blackening operation process:
Workpiece clamping → degreasing → cleaning → pickling → oxidation → cleaning → saponification → hot water boiling and washing → inspection
(1) Workpiece clamping
According to the shape and size of the workpiece, a special fixture or spreader should be designed. The purpose is to leave enough gaps between the workpieces, the workpieces can not contact each other, so that each workpiece can be completely immersed in the oxidizing liquid to be oxidized.
(2) Degreasing
The purpose is to remove oil stains on the surface of the workpiece.
(3) Pickling
The purpose of pickling is to remove rust on the surface of the workpiece. Because rust will hinder the formation of dense Fe304 layer. Even if the workpiece has no rust, it should be pickled, because it will further remove the oil stains, and the pickling will increase the activation energy of the surface molecules of the workpiece, which can be oxidized in the next process and can generate a thicker Fe304 layer.

Plating Line

Test Equipment

Heat Treatment

1.Q:Are you a factory or a trader?

A:We're factory with more than 20 years' experience.

2.Q:Can we visit your factory?

A:Sure, We welcome you to visit our factory.

3.Q:How to get an accurate quote?

A:Pls send us an inquiry with detailed specifications, if you have a sample or technical drawing, it is much better.

4.Q:What is the payment terms?

A:We prefer 50% advance payment with balance against before shipment. It can be negotiated.

About us

Jiaxing Dexun Co., Ltd. was established in 1997, origin from Taiwan, we are professional manufacturer and exporter integrated with design, research & development, manufacturing and sales of OEM/ODM stamping parts,deep drawing parts, standard welding fasteners and non-standard welding fasteners.

* Located in jiaxing city, only about 1 hour's drive from Shanghai, Hangzhou, Ningbo, Suzhou, these important cities, the transportation is very convenient.

* 2 mature mould development workshops with advanced equipment to develop mould for customers.

* 2 International approvals,Verify & certificate in accordance with ISO9001,IATF16949, work with SGS, operate the PPAP Level 3.

* 2 labs of quality inspection,Control products quality strictly; equipped with various quality testing machines including direct-reading spectrometers, tensile testing machines, CMM machine, X-ray flaw detection instrument.

* 2 quenching and tempering heat treatment lines.

* 2 automatic welding lines.

* 4 Powder coating & Painting lines, Plating lines

* 42 people professional R&D team : 30 special technicians and 12 senior engineers.

* 20 years’experience on manufacturering OEM/ODM products

* 100 sets of automatic production machines: Have 10 sets of automatic stamping & deep drawing equipments, 50 cold forming machines; 40 tooth grinding machines ,equipped with Japan, Germany,etc imported machines.

* 175 employees

* 10 millions monthly production capacity

* 35 countries exported to

* Supplying products to GM,John deere,Wal-Mart，etc

* Implement environment protection concept; strictly operate the facilities and processes under environmental requirements.

We use advanced equipment to improve cost and quality at the same time to make sure lowest price and best quality for customers. We have quality control experts & engineers to test every piece product before shipment. We keep on studying to provide professional service.

Our Mission & Vision

We always work hard to be an environment protection model enterprise. We strive for sustainable development. We hope to be a win-win partner of our customers all over the world.

Environment protection mission:

A full series of environment policies are applied to our every manufacturing activities. Firstly, to propagandize environment protection policy to make sure environment-friendly concept is everywhere in our company.
Every new staff will have environment protection training class. All staffs have environment protection knowledge and policy lecture every month. All the operation manual will marked out environment protection requirements.
Secondly, to establish environment protection responsibility policy.
Thirdly, to have basic environment protection management.
Step 1: Have environment monitor every time.
Step 2: Manage the pollutant treatment equipment efficiently.
Step 3: Establish permit system of pollutant discharge.
Step 4: Establish legal audit system.
Fourthly, to build up emergency rescue system.